Service Productivity Management --- Status Quo and Directions for the Design of Conceptual Modeling Grammars.
J. Becker, D. Beverungen, R. Knackstedt, H. Peter Rauer, D. Sigge, in: Proceedings of the 45th Hawaii International Conference on System Sciences (HICSS) 2012, Kauai, USA, 2012, pp. 1522--1531.