Youming Li Amir Leshem Liming Fang Computationally efficient approximated matrix inversion with application to crosstalk precoding in downstream VDSL. 429-433 2007 conf/iwcmc/2007 IWCMC http://doi.acm.org/10.1145/1280940.1281032 db/conf/iwcmc/iwcmc2007.html#LiLF07