@book {, title = {Αντικειμενοστρεφής Ανάπτυξη Λογισμικού με την UML}, year = {2006}, publisher = {Κλειδάριθμος}, organization = {Κλειδάριθμος}, author = {Vasilis Gerogiannis and George Kakarotzas and Achilles Kameas and Ioannis Stamelos and Panagiotis Fitsilis} }