conf/sigmod/75 L. S. Schneider C. R. Spath Quantitative Data Description. 167-185 1975 SIGMOD Conference db/conf/sigmod/sigmod75.html#SchneiderS75 http://doi.acm.org/10.1145/500080.500105 db/conf/sigmod/SchneiderS75.html SIGMOD75/P167.PDF ... journals/cacm/Cardenas73 ... ... journals/cacm/Codd70 ... ... ... ...