@incollection{TUW-102308, author = {Spiess, Stephan and L{\"o}ffelmann, Helwig}, title = {Easy and Modular Modelling of Reflection and Refraction}, booktitle = {Optical Measurement Techniques IV}, year = {1997}, editor = {Kahmen, Heribert and Gruen, A}, pages = {29--35}, publisher = {Wichmann} }