Hyun Jong Yang Won-Yong Shin Bang Chul Jung Arogyaswami Paulraj Opportunistic interference alignment for MIMO IMAC: Effect of user scaling over degrees-of-freedom. 2636-2640 2012 ISIT https://doi.org/10.1109/ISIT.2012.6283996 conf/isit/2012 db/conf/isit/isit2012.html#YangSJP12