Gesualdo Scutari Daniel Pérez Palomar Sergio Barbarossa Asynchronous Iterative Water-Filling for Gaussian Frequency-Selective Interference Channels. 2868-2878 2008 54 IEEE Transactions on Information Theory 7 http://dx.doi.org/10.1109/TIT.2008.924723 db/journals/tit/tit54.html#ScutariPB08