Title	Viewpoints Diagram: Towards an innovative diagram in the UML Language
Author	Ahmed Ettalbi, Mahmoud Nassar, Boubker Sbihi
Citation	Vol. 12  No. 8  pp. 49-54
Keywords	Complex systems, UML, View and Viewpoint, Modeling, Petri networks

Title	Using Colored Petri Networks for Modeling Multiview Class
Author	ZEDDARI Abderrazzak, ETTALBI Ahmed, NASSAR Mahmoud
Citation	Vol. 13  No. 8  pp. 25-30
Keywords	Complex systems, UML, View and Viewpoint, Modelling, Petri networks, colored Petri nets.