PUMA publications for /group/open-access/program%20cloud%20API%20specification%20codeTue Jun 26 09:23:23 CEST 20182013 13th IEEE/ACM International Symposium on Cluster, Cloud, and Grid Computing05112-119SYBL: An Extensible Language for Controlling Elasticity in Cloud Applications2013cloud code system SYBL specification Elasticity API soc2018 application program