Dieter K. Hammer Onno S. van Roosmalen Lonnie R. Welch Classifying Object-Oriented Real-time Systems: Ada 95 and Deal. 324-331 1996 conf/ecbs/1996 ECBS http://doi.ieeecomputersociety.org/10.1109/ECBS.1996.494545 db/conf/ecbs/ecbs1996.html#HammerRW96