Items where Author is "Ptak, A."

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Article

Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13. (2021) F. Fuerst, D. J. Walton, M. Heida, M. Bachetti, C. Pinto, M. J. Middleton, M. Brightman, H. P. Earnshaw, D. Barret, A. C. Fabian, P. Kretschmar, K. Pottschmidt, A. Ptak, T. Roberts, D. Stern, N. Webb and J. Wilms