PT Unknown AU Decker, C Riedel, T Beigl, M de Souza, LMS Spiess, P Muller, J Haller, S TI Collaborative business items SE 2007 3rd IET International Conference on Intelligent Environments, Ulm, Germany, 24-25 Sept. 2007 PY 2007 BP 40 EP 47 DI 10.1049/cp:20070345 LA english ER