The data that you won't find in databases

Peter Buneman, David Maier
1995 Proceedings of the 1995 ACM SIGMOD international conference on Management of data - SIGMOD '95  
doi:10.1145/223784.223863 dblp:conf/sigmod/BunemanM95 fatcat:3p34kb2yyjevjizrqvtcwmmeye