00321nas a2200121   4500000000100000000000100001008004100002260003900043100001900082700002200101700001700123245005900140       2012                            d  c20-22 Nov. 2012aBelgrade, Serbia 1 aSamir Fazlagic1 aNarcis Behlilovic1 aSasa Mrdovic00aControlled Delegation of Signature in Workflow Systems