conf/pods/89 Alexander Borgida Type Systems for Querying Class Hierarchies with Non-strict Inheritance. 394-400 1989 PODS db/conf/pods/pods89.html#Borgida89 http://doi.acm.org/10.1145/73721.73759 db/conf/pods/Borgida89.html journals/anthology/cd1-3:PODS89/P394.PDF journals/anthology/dvd1:text/1-3/PODS89/P394.PDF journals/tods/AlbanoCO85 conf/sigmod/Borgida88 ... ... journals/jlp/DowlingG84 conf/aaai/EtheringtonR83 journals/tods/MylopoulosBW80 ... journals/jcss/Pratt80 journals/tods/Shipman81 conf/lics/Wand87 conf/sigmod/Zaniolo83