Cecilia Di Chio Alberto Moraglio Riccardo Poli Geometric particle swarm optimisation on binary and real spaces: from theory to practice. 2659-2666 2007 conf/gecco/2007c GECCO (Companion) http://doi.acm.org/10.1145/1274000.1274079 db/conf/gecco/gecco2007c.html#ChioMP07