Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsGrowth Curves for a Mixture of Two Subpopulationshttp://demonstrations.wolfram.com/GrowthCurvesForAMixtureOfTwoSubpopulations/]]>http://demonstrations.wolfram.com/GrowthCurvesForAMixtureOfTwoSubpopulations/