@article{IR,
      recid = {3843},
      author = {Zhu, Jianhua},
      title = {Abstract object in an object-oriented data model},
      address = {1987},
      number = {IR},
      abstract = {cse-87-015},
      url = {http://digitalcollections.ohsu.edu/record/3843},
      doi = {https://doi.org/10.6083/cf95jb762},
}