Sergey Smirnov 0002 Hajo A. Reijers Mathias Weske A Semantic Approach for Business Process Model Abstraction. 497-511 2011 CAiSE http://dx.doi.org/10.1007/978-3-642-21640-4_37 conf/caise/2011 db/conf/caise/caise2011.html#SmirnovRW11