Frank Neumann Dirk Sudholt Carsten Witt Comparing Variants of MMAS ACO Algorithms on Pseudo-Boolean Functions. 61-75 2007 conf/sls/2007 SLS http://dx.doi.org/10.1007/978-3-540-74446-7_5 db/conf/sls/sls2007.html#NeumannSW07