S. Bleul, T. Weise, and K. Geihs. Proceedings of 2006 IEEE Joint Conference on E-Commerce Technology and Enterprise Computing, E-Commerce and E-Services (CEC/EEE'06), page 427--429. IEEE Computer Society: Piscataway, NJ, USA, (2006)1st place in 2006 WSC..
S. Bleul, T. Weise, and K. Geihs. Proceedings of IEEE Joint Conference on E-Commerce Technology (9th CEC) and Enterprise Computing, E-Commerce and E-Services (4th EEE) (CEC/EEE'07), page 517--520. IEEE Computer Society: Piscataway, NJ, USA, (2007)2nd place in 2007 WSC..