Ioannis Papagiannis Dimosthenis Kyriazis Magdalini Kardara Vassiliki Andronikou Theodora A. Varvarigou Business Relationships in Grid Workflows. 28-40 2008 GECON http://dx.doi.org/10.1007/978-3-540-85485-2_3 conf/gecon/2008 db/conf/gecon/gecon2008.html#PapagiannisKKAV08