Items where Author is "Forbrich, Jan"

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A dual-band centimetre continuum monitoring survey of young stellar objects in the Coronet Cluster. (2026) Johanan Ramírez-Arellano, Carlos Carrasco-González, Roberto Galván-Madrid, Hauyu Baobab Liu, Jan Forbrich, Arpan Ghosh, Yenifer Angarita and Carlos G Román-Zuñiga

Dynamical masses of YSOs with the VLBA : DYNAMO VLBA: Trigonometric parallaxes and proper motions of YSOs in Orion. (2026) Sergio A. Dzib, Jazmín Ordóñez-Toro, Laurent Loinard, Marina Kounkel, Gisela Ortiz-Leon, Phillip A. B. Galli, Luis F. Rodríguez, Amy J. Mioduszewski, Josep M. Masqué, Eoin O'Kelly, Jan Forbrich and Karla Moo-Herrera picture_as_pdf

Dynamical masses of young stellar objects with the VLBA : DYNAMO-VLBA: Radio binary stars in Orion. (2026) Sergio A. Dzib, Jazmín Ordóñez-Toro, Laurent Loinard, Marina Kounkel, Gisela Ortiz-Leon, Phillip A. B. Galli, Luis F. Rodríguez, Amy J. Mioduszewski, Josep M. Masqué, Eoin O'Kelly, Jan Forbrich and Karla Moo-Herrera

Resolved Dust Emission and CO Isotopologues in Giant Molecular Clouds of the Andromeda Galaxy. (2026) Chloe Bosomworth, Jan Forbrich, Charles J. Lada and Glen Petitpas

The Relationship between Accretion and Ionised Ejection among Young Stellar Objects in the Coronet Cluster. (2026) Arpan Ghosh, Roberto Galván-Madrid, Johanan Ramírez-Arellano, Carlos Carrasco-González, Gráinne Costigan, Suzanne Ramsay, Carlo Manara, Jan Forbrich, Hauyu Baobab Liu and Michihiro Takami

The past, present and future of observations of externally irradiated disks. (2025) Planet formation environments collaboration, Megan Allen, Rossella Anania, Morten Andersen, Mari-Liis Aru, Giulia Ballabio, Nicholas P. Ballering, Giacomo Beccari, Olivier Berné, Arjan Bik, Ryan Boyden, Gavin Coleman, Javiera Díaz-Berrios, Joseph W. Eatson, Jenny Frediani, Jan Forbrich, Katia Gkimisi, Javier R. Goicoechea, Saumya Gupta, Mario G. Guarcello, Thomas J. Haworth, William J. Henney, Andrea Isella, Dominika Itrich, Luke Keyte, Jinyoung Serena Kim, Michael Kuhn, Franck Le Petit, Lilian Luo, Carlo Manara, Karina Maucó, Raphaël Meshaka, Samuel Millstone, James E. Owen, Sébastien Paine, Richard J. Parker, Tyger Peake, Megan Peatt, Paola Pinilla, Lin Qiao, María Claudia Ramírez-Tannus, Suzanne Ramsay, Megan Reiter, Ciarán Rogers, Giovanni Rosotti, Ilane Schroetter, Andrew Sellek, Leonardo Testi, Sierk van Terwisga, Silvia Vicente, Catherine Walsh, Andrew Winter, Nicholas J. Wright and Peter Zeidler

The Proxima Centauri Campaign—First Constraints on Millimeter Flare Rates from ALMA. (2025) Kiana Burton, Meredith A. MacGregor, Rachel A. Osten, Ward S. Howard, Alycia J. Weinberger, Evgenya Shkolnik, David J. Wilner, Jan Forbrich and Thomas Barclay

Characterizing the Multiple Protostellar System VLA 1623-2417 with JWST, ALMA, and VLA: Outflow Origins, Dust Growth, and an Unsettled Disk. (2025) Isaac C. Radley, Gemma Busquet, John D. Ilee, Hauyu Baobab Liu, Jaime E. Pineda, Klaus M. Pontoppidan, Enrique Macías, María José Maureira, Eleonora Bianchi, Tyler L. Bourke, Claudio Codella, Jan Forbrich, Josep M. Girart, Melvin G. Hoare, Ricardo Hernández Garnica, Izaskun Jiménez-Serra, Laurent Loinard, Jazmín Ordóñez-Toro and Linda Podio picture_as_pdf

Cloud-scale elemental abundance variations and the CO-to-dust-mass conversion factor in M31. (2025) Chloe Bosomworth, Jan Forbrich, Charles J Lada, Nelson Caldwell, Chiaki Kobayashi and Sébastien Viaene

Multi-Observatory Study of Young Stellar Energetic Flares (MORYSEF) : No Evidence For Abnormally Strong Stellar Magnetic Fields After Powerful X-ray Flares. (2025) Konstantin V. Getman, Oleg Kochukhov, Joe P. Ninan, Eric D. Feigelson, Vladimir S. Airapetian, Abygail R. Waggoner, L. Ilsedore Cleeves, Jan Forbrich, Sergio A. Dzib, Charles J. Law, Christian Rab and Daniel M. Krolikowski picture_as_pdf

Multi-Observatory Research of Young Stellar Energetic Flares (MORYSEF) : X-ray Flare Related Phenomena and Multi-epoch Behavior. (2024) Konstantin V. Getman, Eric D. Feigelson, Abygail R. Waggoner, L. Ilsedore Cleeves, Jan Forbrich, Joe P. Ninan, Oleg Kochukhov, Vladimir S. Airapetian, Sergio A. Dzib, Charles J. Law and Christian Rab

Using 26Al to detect ongoing self-enrichment in young massive star clusters. (2024) Katarzyna Nowak, Martin G. H. Krause, Thomas Siegert, Jan Forbrich, Robert M. Yates, Laura Ramírez-Galeano, Corinne Charbonnel and Mark Gieles picture_as_pdf

The Molecular Clouds of M31. (2024) Charles J. Lada, Jan Forbrich, Glen Petitpas and Sebastien Viaene picture_as_pdf

Tracing Dense Gas in Six Resolved GMCs of the Andromeda Galaxy. (2023) Jan Forbrich, Charles J. Lada, Jérôme Pety and Glen Petitpas

VISIONS: The VISTA Star Formation Atlas. (2023) Stefan Meingast, João Alves, Hervé Bouy, Monika G. Petr-Gotzens, Verena Fürnkranz, Josefa E. Großschedl, David Hernandez, Alena Rottensteiner, Magda Arnaboldi, Joana Ascenso, Amelia Bayo, Erik Brändli, Anthony G. A. Brown, Jan Forbrich, Alyssa Goodman, Alvaro Hacar, Birgit Hasenberger, Rainer Köhler, Karolina Kubiak, Michael Kuhn, Charles Lada, Kieran Leschinski, Marco Lombardi, Diego Mardones, Laura Mascetti, Núria Miret-Roig, André Moitinho, Koraljka Mužic, Martin Piecka, Laura Posch, Timo Prusti, Karla Peña Ramírez, Ronny Ramlau, Sebastian Ratzenböck, Germano Sacco, Cameren Swiggum, Paula Stella Teixeira, Vanessa Urban, Eleonora Zari and Catherine Zucker

An Ionized Outflow in Orion-KL Source I? (2023) Melvyn Wright, Tomoya Hirota, Jan Forbrich, Richard Plambeck, John Bally, Ciriaco Goddi, Adam Ginsburg and Brett McGuire

The Mouse That Squeaked: A Small Flare from Proxima Cen Observed in the Millimeter, Optical, and Soft X-Ray with Chandra and ALMA : A small flare from Proxima Cen observed in the millimeter, optical, and soft X-ray with Chandra and ALMA. (2022) Ward S. Howard, Meredith A. MacGregor, Rachel Osten, Jan Forbrich, Steven R. Cranmer, Isaiah Tristan, Alycia J. Weinberger, Allison Youngblood, Thomas Barclay, R. O. Parke Loyd, Evgenya L. Shkolnik, Andrew Zic and David J. Wilner picture_as_pdf

The JCMT Transient Survey : Single Epoch Transients and Variability of Faint Sources. (2022) Doug Johnstone, Bhavana Lalchand, Steve Mairs, Hsien Shang, Wen Ping Chen, Geoffrey C. Bower, Gregory J. Herczeg, Jeong-Eun Lee, Jan Forbrich, Bo-Yan Chen, Carlos Contreras-Pena, Yong-Hee Lee, Wooseok Park, Colton Broughton, Spencer Plovie and The JCMT Transient Team

Nonthermal Radio Continuum Emission from Young Nearby Stars. (2022) Ralf Launhardt, Laurent Loinard, Sergio A. Dzib, Jan Forbrich, Geoffrey C. Bower, Thomas K. Henning, Amy J. Mioduszewski and Sabine Reffert

The JCMT Transient Survey: Four-year Summary of Monitoring the Submillimeter Variability of Protostars. (2021) Yong-Hee Lee, Doug Johnstone, Jeong-Eun Lee, Gregory Herczeg, Steve Mairs, Carlos Contreras-Peña, Jennifer Hatchell, Tim Naylor, Graham S. Bell, Tyler L. Bourke, Colton Broughton, Logan Francis, Aashish Gupta, Daniel Harsono, Sheng-Yuan Liu, Geumsook Park, Spencer Plovie, Gerald H. Moriarty-Schieven, Aleks Scholz, Tanvi Sharma, Paula Stella Teixeira, Yao-Te Wang, Yuri Aikawa, Geoffrey C. Bower, Huei-Ru Vivien Chen, Jaehan Bae, Giseon Baek, Scott Chapman, Wen Ping Chen, Fujun Du, Somnath Dutta, Jan Forbrich, Zhen Guo, Shu-ichiro Inutsuka, Miju Kang, Helen Kirk, Yi-Jehng Kuan, Woojin Kwon, Shih-Ping Lai, Bhavana Lalchand, James M. M. Lane, Chin-Fei Lee, Tie Liu, Oscar Morata, Samuel Pearson, Andy Pon, Dipen Sahu, Hsien Shang, Dimitris Stamatellos, Shih-Yun Tang, Ziyan Xu and Hyunju Yoo

From downtown to the outskirts: A radio survey of the Orion Nebula Cluster. (2021) Jaime Vargas-González, Jan Forbrich, Sergio A. Dzib and John Bally

Simultaneous Deep Measurements of CO Isotopologues and Dust Emission in Giant Molecular Clouds in the Andromeda Galaxy. (2021) Sébastien Viaene, Jan Forbrich, Charles J. Lada, Glen Petitpas and Christopher M. Faesi

Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through FUV Observations. (2021) Meredith A. MacGregor, Alycia J. Weinberger, R. O. Parke Loyd, Evgenya Shkolnik, Thomas Barclay, Ward S. Howard, Andrew Zic, Rachel A. Osten, Steven R. Cranmer, Adam F. Kowalski, Emil Lenc, Allison Youngblood, Anna Estes, David J. Wilner, Jan Forbrich, Anna Hughes, Nicholas M. Law, Tara Murphy, Aaron Boley and Jaymie Matthews

A VLBA Survey of radio stars in the Orion Nebula Cluster: I. The nonthermal radio population. (2021) Jan Forbrich, Sergio A. Dzib, Mark J. Reid and Karl M. Menten

A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry. (2021) Sergio A. Dzib, Jan Forbrich, Mark J. Reid and Karl M. Menten

First Resolved Dust Continuum Measurements of Individual Giant Molecular Clouds in the Andromeda Galaxy. (2020) Jan Forbrich, Charles J. Lada, Sébastien Viaene and Glen Petitpas

The Orion Protostellar Explosion and Runaway Stars Revisited : Stellar Masses, Disk Retention, and an Outflow from the Becklin-Neugebauer Object. (2020) John Bally, Adam Ginsburg, Jan Forbrich and Jaime Vargas-Gonzalez picture_as_pdf

The JCMT Transient Survey: An Extraordinary Submillimeter Flare in the T Tauri Binary System JW 566. (2019) Steve Mairs, Bhavana Lalchand, Geoffrey C. Bower, Jan Forbrich, Graham S. Bell, Gregory J. Herczeg, Doug Johnstone, Wen-Ping Chen, Jeong-Eun Lee and Alvaro Hacar

The HP2 Survey - IV. The Pipe nebula : Effective dust temperatures in dense cores. (2018) Birgit Hasenberger, Marco Lombardi, João Alves, Jan Forbrich, Alvaro Hacar and Charles J. Lada

3D shape of Orion A from Gaia DR2. (2018) Josefa E. Grossschedl, Joao Alves, Stefan Meingast, Christine Ackerl, Joana Ascenso, Herve Bouy, Andreas Burkert, Jan Forbrich, Verena Fuernkranz, Alyssa Goodman, Alvaro Hacar, Gabor Herbst-Kiss, Charles J. Lada, Irati Larreina, Kieran Leschinski, Marco Lombardi, Andre Moitinho, Daniel Mortimer and Eleonora Zari

VISION - Vienna survey in Orion. III. Young stellar objects in Orion A. (2018) Josefa E. Großschedl, João Alves, Paula S. Teixeira, Hervé Bouy, Jan Forbrich, Charles J. Lada, Stefan Meingast, Álvaro Hacar, Joana Ascenso, Christine Ackerl, Birgit Hasenberger, Rainer Köhler, Karolina Kubiak, Irati Larreina, Lorenz Linhardt, Marco Lombardi and Torsten Möller

Molecular Cloud Evolution VI. Measuring cloud ages. (2018) Enrique Vázquez-Semadeni, Manuel Zamora-Avilés, Roberto Galván-Madrid and Jan Forbrich

The ALMA view of GMCs in NGC 300 : Physical Properties and Scaling Relations at 10 pc Resolution. (2018) Christopher M. Faesi, Charles J. Lada and Jan Forbrich

A 1.3 mm SMA Survey of 29 Variable Young Stellar Objects. (2018) Hauyu Baobab Liu, Michael M. Dunham, Ilaria Pascucci, Tyler L. Bourke, Naomi Hirano, Steven Longmore, Sean Andrews, Carlos Carrasco-González, Jan Forbrich, Roberto Galván-Madrid, Josep M. Girart, Joel D. Green, Carmen Juárez, Ágnes Kóspál, Carlo Felice Manara, Aina Palau, Michihiro Takami, Leonardo Testi and Eduard I. Vorobyov grid_on

How do stars gain their mass? : A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star Forming Regions. (2017) Gregory J. Herczeg, Doug Johnstone, Steve Mairs, Jennifer Hatchell, Jeong-Eun Lee, Geoffrey C. Bower, Huei-Ru Vivien Chen, Yuri Aikawa, Hyunju Yoo, Sung Ju Kang, Miju Kang, Wen-Ping Chen, Jonathan P. Williams, Jaehan Bae, Michael M. Dunham, Eduard I. Vorobiov, Zhaohuan Zhu, Ramprasad Rao, Helen Kirk, Satoko Takahashi, Oscar Morata, Kevin M. Lacaille, James Lane, Andy Pon, Aleks Scholz, Manash R. Samal, Graham S. Bell, Sarah F. Graves, E'lisa M. Lee, Harriet Parsons, Yuxin He, Jianjun Zhou, Mi Ryang Kim, Scott Chapman, Emily Drabek-Maunder, Eun Jung Chung, Stewart P.S. Eyres, Jan Forbrich, Lynne A. Hillenbrand, Shu Ichiro Inutsuka, Gwanjeong Kim, Kyoung Hee Kim, Yi-Jehng Kuan, Woojin Kwon, Shih Ping Lai, Bhavana Lalchand, Chang Won Lee, Chin-Fei Lee, Feng Long, A. Ran Lyo, Lei Qian, Peter Scicluna, Archana Soam, Dimitris Stamatellos, Shigehisa Takakuwa, Ya-Wen Tang, Hongchi Wang and Yiren Wang

Extreme radio flares and associated X-ray variability from young stellar objects in the Orion Nebula Cluster. (2017) Jan Forbrich, Mark J. Reid, Karl M. Menten, Victor M. Rivilla, Scott J. Wolk, Urvashi Rau and Claire J. Chandler

Radio Measurements of the stellar proper motions in the core of the Orion Nebula Cluster. (2017) Sergio A. Dzib, Laurent Loinard, Luis F. Rodríguez, Laura Gómez, Jan Forbrich, Karl M. Menten, Marina A. Kounkel, Amy J. Mioduszewski, Lee Hartmann, John J. Tobin and Juana L. Rivera

Gas absorption and dust extinction towards the Orion Nebula Cluster. (2016) Birgit Hasenberger, Jan Forbrich, Joao Alves, Scott Wolk, Stefan Meingast, Konstantin Getman and Ignazio Pillitteri grid_on

High-Precision Radio and Infrared Astrometry of LSPM J1314+1320AB - I : Parallax, Proper Motions, and Limits on Planets. (2016) Jan Forbrich, Trent J. Dupuy, Mark J. Reid, Edo Berger, Aaron Rizzuto, Andrew W. Mann, Michael C. Liu, Kimberly Aller and Adam L. Kraus

High-Precision Radio and Infrared Astrometry of LSPM J1314+1320AB - II: Testing Pre--Main-Sequence Models at the Lithium Depletion Boundary with Dynamical Masses. (2016) Trent J. Dupuy, Jan Forbrich, Aaron Rizzuto, Andrew W. Mann, Kimberly Aller, Michael C. Liu, Adam L. Kraus and Edo Berger

The Population of Compact Radio Sources in the Orion Nebula Cluster. (2016) Jan Forbrich, Victor M. Rivilla, Karl M. Menten, Mark J. Reid, Claire J. Chandler, Urvashi Rau, Sanjay Bhatnagar, Scott J. Wolk and Stefan Meingast

Resolving Giant Molecular Clouds in NGC 300: : A First Look with the Submillimeter Array. (2016) Christopher Faesi, Charles Lada and Jan Forbrich grid_on

VISION - Vienna survey in Orion I. VISTA Orion A Survey. (2016) Stefan Meingast, João Alves, Diego Mardones, Paula Teixeira, Marco Lombardi, Josefa Großschedl, Joana Ascenso, Herve Bouy, Jan Forbrich, Alyssa Goodman, Alvaro Hacar, Birgit Hasenberger, Jouni Kainulainen, Karolina Kubiak, Charles Lada, Elizabeth Lada, André Moitinho, Monika Petr-Gotzens, Lara Rodrigues and Carlos G. Román-Zúñiga grid_on

Radio monitoring of the periodically variable IR source LRLL 54361: No direct correlation between the radio and IR emissions. (2015) Jan Forbrich, Luis F. Rodríguez, Aina Palau, Luis A. Zapata, James Muzerolle and Robert A. Gutermuth

Smoke in the Pipe Nebula: dust emission and grain growth in the starless core FeSt 1-457. (2015) Jan Forbrich, Charles J. Lada, Marco Lombardi, Carlos Roman-Zuñiga and João Alves

Constraints on photoevaporation models from (lack of) radio emission in the Corona Australis protoplanetary disks. (2014) Roberto Galván-Madrid, Hauyu Baobab Liu, Carlo Felice Manara, Jan Forbrich, Ilaria Pascucci, Carlos Carrasco-González, Ciriaco Goddi, Yasuhiro Hasegawa, Michihiro Takami and Leonardo Testi grid_on

Some like it cold: molecular emission and effective dust temperatures of dense cores in the Pipe Nebula. (2014) Jan Forbrich, Karin Öberg, Charles J. Lada, Marco Lombardi, Alvaro Hacar, João Alves and Jill M. Rathborne

CSI 2264: Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer-- evidence for multiple origins of variability. (2014) Ann Marie Cody, John Stauffer, Annie Baglin, Giuseppina Micela, Luisa M. Rebull, Ettore Flaccomio, María Morales-Calderón, Suzanne Aigrain, Jèrôme Bouvier, Lynne A. Hillenbrand, Robert Gutermuth, Inseok Song, Neal Turner, Silvia H. P. Alencar, Konstanze Zwintz, Peter Plavchan, John Carpenter, Krzysztof Findeisen, Sean Carey, Susan Terebey, Lee Hartmann, Nuria Calvet, Paula Teixeira, Frederick J. Vrba, Scott Wolk, Kevin Covey, Katja Poppenhaeger, Hans Moritz Günther, Jan Forbrich, Barbara Whitney, Laura Affer, William Herbst, Joseph Hora, David Barrado, Jon Holtzman, Franck Marchis, Kenneth Wood, Marcelo Medeiros Guimarães, Jorge Lillo Box, Ed Gillen, Amy McQuillan, Catherine Espaillat, Lori Allen, Paola D'Alessio and Fabio Favata

Book Section

Meter- to Millimeter Emission from Cool Stellar Systems : Latest Results, Synergies Across the Spectrum, and Outlook for the Next Decade. (2018) Jan Forbrich, Peter K. G. Williams, Emily Drabek-Maunder, Ward Howard, Moira Jardine, Lynn Matthews, Sofia Moschou, Robert Mutel, Luis Quiroga-Nuñez, Joseph Rodriguez, Jackie Villadsen, Andrew Zic, Rachel Osten, Edo Berger and Manuel Güdel

Conference or Workshop Item

Star and Stellar Cluster Formation: ALMA-SKA Synergies. (2015) Jan Forbrich, J. Rathbone, G. Fuller, S. Longmore and S. Molinari

Tomography of Galactic star-forming regions and spiral arms with the Square Kilometer Array. (2014) Laurent Loinard, Mark Thompson, Melvin Hoare, Huib Jan van Langevelde, Simon Ellingsen, Andreas Brunthaler, Jan Forbrich, Kazi L. J. Rygl, Luis F. Rodriguez, Amy J. Mioduszewski, Rosa M. Torres-Lopez, Sergio A. Dzib, Gisela N. Ortiz-Leon, Tyler L. Bourke and James A. Green

Book

Proceedings of Abstracts, School of Physics, Engineering and Computer Science Research Conference 2022. (2022) Daerefa-a Amafabia, Laurel Asimea, John Bally, Anthony Baran, Adam Boies, Amirhossein Borjali, Chloe Bosomworth, Ben Burningham, Napoleana-Anna Chaliasou, Yong Kang CHEN, Yuen Ki Cheong, Mahmoud Chizari, Etelka Chung, Kristen Coppin, Opukuro David-West, Nik Dennler, Hom Dhakal, Nikolay Dimov, Emil Dmitruk, Allen Donald, Damien Drix, Sergio A. Dzib, Mahmoud Eltaweel, Sajid Fadlelseed, Atena Farahani, Adrian Felix, Tim Foat, Jan Forbrich, Maximilien Franco, Joesphine Gaarn, Tracy Garratt, Jim Geach, Narges Ghias, Adrian Ghita, Niccolo Giannetti, Jaime Vargas-Gonzalez, Richard Greenaway, George Haritos, Sara Hatami, David Haydock, Na Helian, Mohammad Reza Herfatmanesh, Jean-Baptiste Herve, Evelyn Hesse, Hossein Korani, Vahid Hosseini, Wei Hu, Thomas Hubbard, Jameel Inal, Patrick Irigo, Sikiru O. Ismail, Fiona Jepleting, Wei Ji, Ian Johnston, Gbanaibolou Jombo, Shabnam Kadir, Christos Kalyvas, Syed Muhammad Kamran, Antonios Kanellopoulos, Aklil Zenebe Kiflay, Raimund Kirner, Kerry Knox, Chiaki Kobayashi, Dhirendra Kumar, Ritesh Kumar, Peter Lane, Himayasri Lekkala, Andrew Lewis, Liang Li, Qi Luo, Hossein Madani, Colin Mallet, Surya Maruthupandian, Elizabeth Reeja Mathen, Pavel Matousek, Simon McCool, James C. McGarry, Catherine Menon, Christoph Metzner, Rachael E. H. Miles, Hadi Moeinnia, Paul Moggridge, Mahdi Mohseni, Diogo Montalvão, Mohammad Najeeb Moraby, Darragh Murnane, Marc Norgate, Amir Nourani, Kumar Shantanu Prasad, Soodamani Ramalingam, Shavika Rastogi, Jonathan P. Reid, Guogang Ren, Victor M. Rivilla, Hossein Saidpour, Kiyoshi Saito, Seyed Amir Hossein Sajedi, Christoph Salge, Samadhi Samararatne, Michael Schmuker, Elif Sensoy, Ajay Shriram, Harpreet Singh, Yasser Sorouraddin, Volker Steuber, Nicholas Stone, Yi Sun, Roopesh Sureddi, Samuel Sutton, Peter Thomas, Andrew R Timms, P. R. Tiwari, Athanasios Tsokanos, Mansukhlal Vadalia, Muhammad Yaqoob, Muhamad Yulianto and Minghua Zheng picture_as_pdf