The sloan digital sky survey reverberation mapping project: Ensemble spectroscopic variability of quasar broad emission lines

Mouyuan Sun, Jonathan R. Trump, Yue Shen, W. N. Brandt, Kyle Dawson, Kelly D. Denney, Patrick B. Hall, Luis C. Ho, Keith Horne, Linhua Jiang, Gordon T. Richards, Donald P. Schneider, Dmitry Bizyaev, Karen Kinemuchi, Daniel Oravetz, Kaike Pan, Audrey Simmons