Emission Trade Assistant: Prototype Implementation and Lessons learned. - Philip Joschko; Hennes Schäfer; Nicolas Denz; Christian Schmitz; Bernd Page (EnviroInfo, 2011)

Modeling of cooperative tasks in Business-IT management - A proposal for a domain-specific extension of BPMN 2.0. - Marcel Morisse; Hennes Schäfer; Paul Drews (AMCIS, 2012)