Radhika Gowaikar Babak Hassibi Statistical Pruning for Near-Maximum Likelihood Decoding. 2661-2675 2007 55 IEEE Transactions on Signal Processing 6-1 http://doi.ieeecomputersociety.org/10.1109/TSP.2006.890912 db/journals/tsp/tsp55.html#GowaikarH07