Walter, "Extending UML to GUI Modeling," Mensch & Computer, pp. 307-308, 2004.K. Blankenhorn and W. Walter, „Extending UML to GUI Modeling," in Mensch & Computer 2004: Allgegenwartige Interaktion, R.Keil- Slawik, H. Selke and G. Szwillus, Eds., Munchen: Oldenburg Verlag, 2004,...