Jovita Nenortaite Rimvydas Simutis Stocks' Trading System Based on the Particle Swarm Optimization Algorithm. 843-850 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3039&spage=843 2004 conf/iccS/2004-4 International Conference on Computational Science db/conf/iccS/iccS2004-4.html#NenortaiteS04