Gobbi A, Albanese D, Iorio F, Jurman G and . JS (2014).
BiRewire: High-performing routines for the randomization of a bipartite
graph (or a binary event matrix) preserving degree distribution
(or marginal totals)..
R package version 1.8.0, http://www.ebi.ac.uk/~iorio/BiRewire.