Arlindo Silva Ana Neves Ernesto Costa An Empirical Comparison of Particle Swarm and Predator Prey Optimisation. 103-110 2002 conf/aics/2002 AICS http://link.springer.de/link/service/series/0558/bibs/2464/24640103.htm db/conf/aics/aics2002.html#SilvaNC02