Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsNon-Sinusoidal Oscillation: A Balloon on a Stringhttp://demonstrations.wolfram.com/NonSinusoidalOscillationABalloonOnAString/]]>http://demonstrations.wolfram.com/NonSinusoidalOscillationABalloonOnAString/