conf/pods/84 Serge Abiteboul Richard Hull IFO: A Formal Semantic Database Model. 119-132 1984 PODS db/conf/pods/pods84.html#AbiteboulH84 http://doi.acm.org/10.1145/588011.588029 db/conf/pods/AbiteboulH84.html journals/anthology/cd1-3:PODS84/P119.PDF journals/anthology/dvd1:text/1-3/PODS84/P119.PDF journals/tods/AbiteboulH87 conf/vldb/BrownP83 conf/sigmod/BunemanF79 journals/tods/Chen76 conf/sigmod/Codd71 journals/tods/Codd79 journals/tods/HammerM81 ... journals/jacm/HullY84 ... journals/tods/Kent79 ... conf/jcdkb/KingM82 ... ... journals/tods/MylopoulosBW80 journals/tods/Shipman81 journals/tods/SmithS77 ... journals/tse/YaoWH82