Petia Wohed, Nick Russell, Arthur H. M. ter Hofstede, Birger Andersson, Wil M. P. van der Aalst. Patterns-based evaluation of open source BPM systems: The cases of jBPM, OpenWFE, and Enhydra Shark. Information \& Software Technology, 51(8):1187-1216, 2009. [doi]
Abstract is missing.