Panagiotis Symeonidis Alexandros Nanopoulos Apostolos Papadopoulos Yannis Manolopoulos Nearest-Biclusters Collaborative Filtering with Constant Values. 36-55 2006 conf/kdd/2006web WEBKDD http://dx.doi.org/10.1007/978-3-540-77485-3_3 db/conf/kdd/webkdd2006.html#SymeonidisNPM06