João Pedro Sousa Vahe Poladian David Garlan Bradley R. Schmerl Peter Steenkiste Steps toward activity-oriented computing. 1-5 2008 IPDPS http://dx.doi.org/10.1109/IPDPS.2008.4536432 conf/ipps/2008 db/conf/ipps/ipdps2008.html#SousaPGSS08