1. Baroth, C.H., 1995. Visual programming in the real world. In: Burnett, M.M., Goldberg, A., Lewis, T. (Eds.), Visual Object-oriented Programming Concepts and Environments, pp. 21–42
2. Object-oriented Design with Applications;Booch,1991
3. Breen, D.E., Getto, P.H., Apocada, A.A., Schmidt, D.G., Sarachan, B.D., 1987. The clockworks: an object-oriented computer animation system. In: Proceedings of Eurographics, pp. 275–282
4. Burnett, M.M., Baker, M.J., Bohus, C., Carlson, P., Yang, S., van Zee, P., 1995. Scaling up visual programming languages. IEEE Computer (March) 45–54
5. Visual-language system for user interfaces;Chang;IEEE Software,1995