Vincenzo Cutello Giuseppe Nicosia Mario Romeo Pietro Simone Oliveto On the Convergence of Immune Algorithms. 409-415 2007 conf/foci/2007 FOCI http://doi.ieeecomputersociety.org/10.1109/FOCI.2007.371504 db/conf/foci/foci2007.html#CutelloNRO07