Paolo Bouquet Luciano Serafini Patrick Brézillon Massimo Benerecetti F. Castellani Modeling and Using Context, Second International and Interdisciplinary Conference, CONTEXT'99, Trento, Italy, September 1999, Proceedings CONTEXT Lecture Notes in Computer Science 1688 Springer 1999 3-540-66432-7 db/conf/context/context1999.html