Rachid Guerraoui Riccardo Capobianchi Agnes Lanusse Pierre Roux Nesting Actions through Asynchronous Message Passing: the ACS Protocol. 170-184 http://link.springer.de/link/service/series/0558/bibs/0615/06150170.htm 1992 conf/ecoop/1992 ECOOP db/conf/ecoop/ecoop92.html#GuerraouiCLR92