Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsParticle Trajectories in a Wien Filterhttp://demonstrations.wolfram.com/ParticleTrajectoriesInAWienFilter/]]>http://demonstrations.wolfram.com/ParticleTrajectoriesInAWienFilter/