The Nested Entity-Relationship Model.

@inproceedings{DBLP:conf/er/CarlsonJA89,
  author    = {C. Robert Carlson and
               Wenguang Ji and
               Adarsh K. Arora},
  editor    = {Frederick H. Lochovsky},
  title     = {The Nested Entity-Relationship Model},
  booktitle = {Entity-Relationship Approach to Database Design and Querying,
               Proceedings of the Eight International Conference on Enity-Relationship
               Approach, Toronto, Canada, 18-20 October, 1989},
  publisher = {North-Holland},
  year      = {1989},
  isbn      = {0-444-88716-4},
  pages     = {43-57},
  ee        = {db/conf/er/CarlsonJA89.html},
  crossref  = {DBLP:conf/er/89},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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