Eugene Wong A Statistical Approach to Incomplete Information in Database Systems. 470-488 TODS7/P470.PDF 1982 7 ACM Trans. Database Syst. 3 db/journals/tods/tods7.html#Wong82 http://doi.acm.org/10.1145/319732.319747 ... ... journals/tods/Lipski79 journals/tods/StonebrakerWKH76 conf/berkeley/Wong77