Powering the Broad H alpha Line in BL Lacertae

Corbett, E.A., Robinson, A., Hough, J., Young, S. and Axon, D.J. (1996) Powering the Broad H alpha Line in BL Lacertae. In: In: Blazar continuum variability, ASP Conference Series 110 :. Astronomical Society of the Pacific, pp. 160-5. ISBN 1-886733-30-9