Abstraction mechanisms in CLU

@article{Liskov1977AbstractionMI,
  title={Abstraction mechanisms in CLU},
  author={Barbara H. Liskov and Alan Snyder and Russell R. Atkinson and Craig Schaffert},
  journal={Communications of The ACM},
  year={1977},
  volume={20},
  pages={564-576}
}
CLU is a new programming language designed to support the use of abstractions in program construction. Work in programming methodology has led to the realization that three kinds of abstractions—procedural, control, and especially data abstractions—are useful in the programming process. Of these, only the procedural abstraction is supported well by conventional languages, through the procedure or subroutine. CLU provides, in addition to procedures, novel linguistic mechanisms that support the… 

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