S. V. Penton

Multiwavelength observations of short-timescale variability in NGC 4151 .1. Ultraviolet observations

Shai Kaspi, V. T. Doroshenko, Belinda J. Wilkes, 1996 .

The Metagalactic Ionizing Radiation Field at Low Redshift

S. V. Penton, D. Roberts, M. Fardal, 1999, astro-ph/9907123.

Multiwavelength observations of short-timescale variability in NGC 4151 .4. Analysis of multiwavelength continuum variability

Gerard A. Kriss, Bradley M. Peterson, Shai Kaspi, 1996 .