1. Goldberg A, Robson D. Smalltalk-80: the language and its implementation. Addison-Wesley, London, 1983
2. 1984 IEEE Computer Society workshop on visual languages, Hiroshima, Japan, December 1984
3. 1986 IEEE Computer Society workshop on visual languages, Dallas, TX, June 1986
4. 1987 IEEE workshop on visual languages, Linkoping, Sweden, August 1987
5. 1988 IEEE workshop on visual languages, Pittsburgh, PA, October 1988