W. Hesse, H. Meerwein-str, D-Marburg, and C. Workflows. Proc. CAiSE'98/LFIP 8.1 Int. Workshop on Evaluation of Modelling Methods in System Analysis and Design (EMMSAD'01), (2001)http://www.uni-marburg.de/fb12/informatik/homepages/hesse/vortraege/dateien/rup.pdf.
R. Klopper, S. Gruner, and D. Kourie. SAICSIT '07: Proceedings of the 2007 annual research conference of the South African institute of computer scientists and information technologists on IT research in developing countries, page 56--65. New York, NY, USA, ACM, (2007)