Bharathi Subramanian Stanley B. Zdonik Theodore W. Leung Scott L. Vandenberg Ordered Types in the AQUA Data Model. 115-135 DBPL1993/P115.pdf 1993 DBPL db/conf/dbpl/dbpl93.html#SubramanianZLV93 conf/dbpl/93 db/conf/dbpl/SubramanianZLV93.html conf/icdt/BeeriK90 journals/jcss/Doner70 journals/sigmod/FrenchJP90 journals/cacm/Frenkel91 conf/pods/GinsburgW92 journals/tois/GutingZC89 conf/stoc/KarpMR72 journals/cacm/LanderLS91 conf/dbpl/LeungMSVVZ93 conf/vldb/Richardson92 journals/mst/ThatcherW68 conf/sigmod/VandenbergD91