Daming Xu Longyun Kang Binggang Cao Graph-Based Ant System for Optimal Sizing of Standalone Hybrid Wind/PV Power Systems. 1136-1146 2006 conf/icic/2006-2 ICIC (2) http://dx.doi.org/10.1007/11816171_141 db/conf/icic/icic2006-2.html#XuKC06