A. I. Shapovalova

Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. II - an intensive study of NGC 5548 at optical wavelengths

B. M. Peterson, T. J. Balonek, E. S. Barker et al. · The Astrophysical Journal · 1991 · 231 citations · Full text

Steps toward determination of the size and structure of the broad-line region in active galatic nuclei. 8: an intensive HST, IUE, and ground-based study of NGC 5548

K. T. Korista, D. Alloin, P. Barr et al. · The Astrophysical Journal Supplement Series · 1995 · 231 citations · Full text

Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XVI. A 13 Year Study of Spectral Variability in NGC 5548

B. M. Peterson, P. Berlind, R. Bertram et al. · The Astrophysical Journal · 2002 · 201 citations · Full text

Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XIV. Intensive Optical Spectrophotometric Observations of NGC 7469

S. Collier, K. Horne, S. Kaspi et al. · The Astrophysical Journal · 1998 · 196 citations · Full text

Engineering, Broad‐line Region, Observational Physics +17

Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XI. Intensive Monitoring of the Ultraviolet Spectrum of NGC 7469

I. Wanders, B. M. Peterson, D. Alloin et al. · The Astrophysical Journal Supplement Series · 1997 · 164 citations · Full text