@inproceedings{DBLP:conf/sigmod/Codd71a,
  author    = {E. F. Codd},
  title     = {Normalized Data Structure: A Brief Tutorial},
  booktitle = {SIGFIDET Workshop},
  year      = {1971},
  pages     = {1-17},
  crossref  = {DBLP:conf/sigmod/71},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/sigmod/71,
  editor    = {E. F. Codd and
               A. L. Dean},
  title     = {Proceedings of 1971 ACM-SIGFIDET Workshop on Data Description,
               Access and Control, San Diego, California, November 11-12,
               1971},
  publisher = {ACM},
  year      = {1971},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}