isl was written by

	    Sven Verdoolaege
2006-2007   Leiden Institute of Advanced Computer Science
	    Universiteit Leiden
	    Niels Bohrweg 1
	    2333 CA Leiden
	    The Netherlands
2008-2009   K.U.Leuven
	    Departement Computerwetenschappen
	    Celestijnenlaan 200A
	    B-3001 Leuven
	    Belgium
2010	    INRIA Saclay - Ile-de-France
	    Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod
	    91893 Orsay
	    France