1. UML : Unified modeling language, version 2.5,2015
2. OCL : Object constraint language 2.4,2014
3. Enhancing unified process workflows using uml;Sarkar,2017
4. Formalization of software process using intuitive mapping of UML activity diagram to CPN;Czopik,2014
5. Towards modeling web service composition in UML;Grønmo,2004