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ABC ALGOL is an extension of the programming language ALGOL 60 with arbitrary data structures and user-defined operators, intended for computer algebra (symbolic mathematics). Despite its advances, it was never used as widely as Algol proper.

References

van de Riet, R.P. (1973). ABC Algol: A Portable Language for Formula Manipulation Systems. Matematisch Centrum (Amsterdam). Retrieved May 26, 2017.
van de Riet, R.P. (1973). ABC Algol: The language. Mathematisch Centrum. Retrieved May 26, 2017.
van de Riet, R.P. (1973). ABC Algol: The compiler. Mathematisch Centrum. Retrieved May 26, 2017.