BibTex format
@article{WARREN:1994:10.1086/173660,
author = {WARREN, SJ and HEWETT, PC and OSMER, PS},
doi = {10.1086/173660},
journal = {ASTROPHYSICAL JOURNAL},
pages = {412--433},
title = {A WIDE-FIELD MULTICOLOR SURVEY FOR HIGH-REDSHIFT QUASARS, Z-GREATER-THAN-OR-EQUAL-TO-2.2 .3. THE LUMINOSITY FUNCTION},
url = {http://dx.doi.org/10.1086/173660},
volume = {421},
year = {1994}
}