@TechReport{FGRV05, author = {Finkel, A. and Geeraerts, G. and Raskin, J.-F. and {Van~Begin}, L.}, title = {A counter-example the the minimal coverability tree algorithm}, institution = {{U}niversit\'e {L}ibre de {B}ruxelles}, year = {2005}, number = {535}, pdf = {http://www.ulb.ac.be/di/ssd/ggeeraer/papers/FGRV05-Coverability.pdf} }