1. Anson, E.: The Device Model of Interaction. — ACM SIGGRAPH Computer Graphics Vol. 16, No. 3, pp. 107–114, 1982.
2. Barth, P.S.: An Object-Oriented Approach to Graphical Interfaces. — ACM Transactions on Graphics Vol. 5, No. 2, pp. 142–172, 1986.
3. Borning, A., Duisberg, R., Freeman-Benson, B., Kramer, A., Woolf, M. : Constraint Hierarchies. — Proceedings OOPSLA’87, ACM Press, pp. 48–60, 1987.
4. Coutaz, J.: PAC, an Object Oriented Model for Dialog Design. — Proceedings Human-Computer Interaction — INTERACTS, North-Holland, pp.431–436, 1987.
5. Conklin, J. : Hypertext: An Introduction and Survey. — IEEE Computer Vol. 20, No.9, pp. 17–41, 1987.