R. Keil-Slawik, T. Hampel, and B. Eßmann. Proceedings 3rd IEEE Int. Conf. on Pervasive Computing and Communications PerCom 2005. Workshop on Pervasive ELearning PerEL'05, page 322-326. Kauai island, Hawaii, (March 2005)
H. Pape, C. Clauser, J. Iffland, R. Krug, and R. Wagner. International Journal of Rock Mechanics and Mining Sciences, 42 (7-8):
1056--1069(2005)Rock Physics and Geomechanics.
R. Wagner, M. Wetzels, and H. Winklhofer. Rejuvenating Marketing: Contamination, Innovation, Integration: Proceedings of the 34th EMAC Conference, Milan, European Marketing Academy, (2005)