Constraints -- A language for expressing almost-hierarchical descriptions. Sussman, G. J. & Jr, G. L. S. AI Journal, 14(1):1--39, Elsevier, 1980.
bibtex   
@article{sussman1980constraints,
  title={Constraints -- A language for expressing almost-hierarchical descriptions},
  author={Sussman, Gerald Jay and Guy Lewis Steele Jr},
  journal={AI Journal},
  volume={14},
  number={1},
  pages={1--39},
  year={1980},
  publisher={Elsevier}
}

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