Average spectra of massive galaxies in the Sloan Digital Sky Survey

Daniel J. Eisenstein, David W. Hogg, Masataka Fukugita, Osamu Nakamura, Mariangela Bernardi, Douglas P. Finkbeiner, David J. Schlegel, J. Brinkmann, Andrew J. Connolly, István Csabai, James E. Gunn, Željko Ivezić, Don Q. Lamb, Jon Loveday, Jeffrey A. Munn, Robert C. Nicol, Donald P. Schneider, Michael A. Strauss, Alex Szalay, Don G. York