In: James H. Davenport; William Farmer; Florian Rabe; Joseph Urban (Hrsg.). Proceedings of Calculemus/MKM 2011. Conferences on Intelligent Computer Mathematics (CICM-11), 10th International Conference on Mathematical Knowledge Management , located at Conference on Intelligent Computer Mathematics, July 18-23, Bertonori, Italy, Pages 164-179, LNAI, No. 6824, Springer-Verlag, Berlin Heidelberg, 7/2011.