Christopher Diggins Abdelwahab Hamou-Lhadj JAction: A High-Level Surface Syntax for UML Action Semantics. 609-614 2008 CIMCA/IAWTIC/ISE https://doi.org/10.1109/CIMCA.2008.142 https://doi.ieeecomputersociety.org/10.1109/CIMCA.2008.142 conf/cimca/2008 db/conf/cimca/cimca2008.html#DigginsH08