SIMULA: an ALGOL-based simulation language
Communications of the ACM
Compiling SIMULA: A Historical Study of Technological Genesis
IEEE Annals of the History of Computing
The development of the SIMULA languages
ACM SIGPLAN Notices - Special issue: History of programming languages conference
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Simula 1 (1962-1964) and Simula 67 (1967) were the first two object-oriented (OO) languages. Simula 67 introduced most of the key concepts of object-oriented programming: objects, classes, subclasses (usually referred to as inheritance), and virtual procedures, combined with safe referencing mechanisms for making the contents of separately compiled classes available to programs.