Kross, Jürgen. "1. Optische Abbildung" Optik. Berlin, Boston: Walter de Gruyter, 2004. 37-188. Web. Retrieved 23 May. 2013, from http://www.degruyter.com/view/books/9783110198041/9783110198041.37/9783110198041.37.xml

Kross, J. (2004). 1. Optische Abbildung. Optik (pp. 37-188). Berlin, Boston: Walter de Gruyter. Retrieved 23 May. 2013, from http://www.degruyter.com/view/books/9783110198041/9783110198041.37/9783110198041.37.xml

Kross, Jürgen. 2004. 1. Optische Abbildung. In Optik, 37-188. Berlin, Boston: Walter de Gruyter. Retrieved 23 May. 2013, from http://www.degruyter.com/view/books/9783110198041/9783110198041.37/9783110198041.37.xml