ElmasriWH85'

@article{DBLP:journals/dke/ElmasriWH85,
  author    = {Ramez Elmasri and
               James A. Weeldreyer and
               Alan R. Hevner},
  title     = {The Category Concept: An Extension to the Entity-Relationship
               Model},
  journal   = {Data Knowl. Eng.},
  volume    = {1},
  number    = {1},
  year      = {1985},
  pages     = {75-116},
  ee        = {http://dx.doi.org/10.1016/0169-023X(85)90027-8},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}