Emile H. L. Aarts Jan van Leeuwen Martin Rem PARLE '91: Parallel Architectures and Languages Europe, Volume II: Parallel Languages, Eindhoven, The Netherlands, June 10-13, 1991, Proceedings PARLE Lecture Notes in Computer Science 506 Springer 1991 3-540-54152-7 db/conf/parle/parle91-2.html