Formal Techniques for Distributed Systems [electronic resource] : Joint 11th IFIP WG 6.1 International Conference FMOODS 2009 and 29th IFIP WG 6.1 International Conference FORTE 2009, Lisboa, Portugal, June 9-12, 2009. Proceedings / edited by David Lee, Antónia Lopes, Arnd Poetzsch-Heffter.