@article{IR,
      author = {Walinsky, Clifford},
      url = {http://digitalcollections.ohsu.edu/record/3840},
      title = {Constructive semantics for negation},
      abstract = {cse-87-009},
      number = {IR},
      doi = {https://doi.org/10.6083/4m90dv81r},
      recid = {3840},
      address = {1987},
}