Abstraction mechanisms in the BETA programming language
Bent Bruun Kristensen, Ole Lehrmann Madsen, Birger Møller-Pedersen, Kristen Nygaard · 1983
The BETA programming language is developed as part of the BETA project. The purpose of this project is to develop concepts, constructs and tools in the field of programming and programming languages. BETA has been developed from 1975 on and the various stages of the language are documented in [BETA a].