conf/vldb/89 Ralf Hartmut Güting Gral: An Extensible Relational Database System for Geometric Applications. 33-44 1989 VLDB db/conf/vldb/vldb89.html#Guting89 db/conf/vldb/Guting89.html VLDB89/P033.PDF ... ... conf/oodbs/CareyDFGMRS86 conf/sigmod/CareyDV88 journals/tods/Codd79 conf/btw/DayalMBCGHOR87 ... conf/sigmod/Freytag87 ... conf/sigmod/GraefeD87 ... conf/edbt/Guting88 ... journals/tois/GutingZC89 conf/sigmod/HaskinL82 conf/sigmod/LindsayMP87 conf/sigmod/Lohman88 conf/oodbs/ManolaD86 journals/tods/NievergeltHS84 ... journals/sigmod/OngFS84 journals/tods/OsbornH86 journals/is/PistorT86 books/sp/PreparataS85 journals/is/SchekS86 conf/icde/SixW88 conf/icde/Stonebraker86 conf/sigmod/StonebrakerR86 ... conf/oodbs/SchwarzCFLMMP86