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)
H. Le, T. Kosch, P. Bader, S. Mayer, and N. Henze. Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems, page 360:1-360:13. New York, NY, USA, ACM, (2018)