1. The Handbook of Plastic Optics, U.S. Precision Lens, Ohio 45245, Cincinnati, 1973. (Chapter 2).
2. Properties of Polymers;Van Krevelen,1997
3. Modern Geometrical Optics;Herzberger,1958
4. Geometrical and Physical Optics;Longhurst,1973
5. Federal Test Method Std, No. 406 Method 3011: Index of Refraction, 1961.