Riichi Kudo Yasushi Takatori Kentaro Nishimori Atsushi Ohta Shuji Kubota User Selection Method for Block Diagonalization in Multiuser MIMO Systems. 3295-3300 2007 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2007.625 conf/globecom/2007 db/conf/globecom/globecom2007.html#KudoTNOK07