When I moved to the new server, I forgot to upload some papers (or whatever you would like to call them) I once wrote. Interestingly, three people (!) already asked for them during the last weeks. Wow. But I still think this is quite boring stuff. Both in german language:
Einige BRDF Modelle
. (BRDF Models explained, with lots of examples, pictures and formulas)
Vergleich der objektorientierten Programmiersprachen Java und C#
(Java vs. CSharp, compared)
Have fun reading/citing/ignoring/whatever them.