Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsOrdinary and Extraordinary Refractive Indices in a 2D Anisotropic Crystalhttp://demonstrations.wolfram.com/OrdinaryAndExtraordinaryRefractiveIndicesInA2DAnisotropicCry/]]>http://demonstrations.wolfram.com/OrdinaryAndExtraordinaryRefractiveIndicesInA2DAnisotropicCry/