G. Zotti, A Wilkie, W. Purgathofer:
"A Critical Review of the Preetham Skylight Model";
Talk: WSCG: International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, Plzen; 2007-01-29 - 2007-02-01; in: "Journal of WSCG 2007", V. Skala (ed.); 15 (2007), ISBN: 978-80-86943-00-8; Paper ID E59, 8 pages.