El-Ghazali Talbi Olivier Roux Cyril Fonlupt Denis Robilliard Parallel Ant Colonies for Combinatorial Optimization Problems. 239-247 1999 conf/ipps/1999w IPPS/SPDP Workshops db/conf/ipps/ippsw1999.html#TalbiRFR99 http://dx.doi.org/10.1007/BFb0097905