T. Richter, and S. Simon. 2012 IEEE International Conference on Image Processing ICIP 2012, page 2501 - 2504. Lake Buena Vista, Florida, USA, IEEE, IEEE, (September 2012)
D. Boehringer, B. Burr, S. Jeschke, and T. Richter. Proceedings of the 2009 World Conference on Educational Multimedia, Hypermedia \\\& Telecommunications, page 1124-1129. Honolulu, HI, USA, AACE, (June 2009)