SPL: An Access Control Language for Security Policies and Complex Constraints.

Carlos Ribeiro Andre Zuquete Paulo Ferreira Paulo Guedes SPL: An Access Control Language for Security Policies and Complex Constraints. 2001 conf/ndss/2001 NDSS http://www.isoc.org/isoc/conferences/ndss/01/2001/papers/ribeiro.pdf db/conf/ndss/ndss2001.html#RibeiroZFG01