Unconventional AGN from the SDSS
  We discuss some of the most unusual active galactic nuclei (AGN) discovered to date by the Sloan Digital Sky Survey (SDSS): the first broad absorption line quasar seen to exhibit He II absorption, several quasars with extremely strong, narrow UV Fe II emission, and an AGN with an unexplained and very strange continuum shape. 
Patrick B. Hall (Princeton), G. R. Knapp, G. T. Richards, M. A.   Strauss, S. F. Anderson, D. P. Schneider, D. A. Vanden Ber...