Goumopoulos, C., P. Alefragis, K. Thrampoulidis, and E. Housos,  "A Generic Legality Checker and Attribute Evaluator for a Distributed Enterprise Environment",  Proceedings of the third IEEE International Symposium on Computers and Communications (ISCC?98), IEEE CS PR08538, Athens, Greece, pp. 286-292, June 30 - July 2, 1998.