conf/vldb/88 Max J. Egenhofer Andrew U. Frank Towards a Spatial Query Language: User Interface Considerations. 124-133 1988 VLDB db/conf/vldb/vldb88.html#EgenhoferF88 db/conf/vldb/EgenhoferF88.html VLDB88/P124.PDF ... ... ... ... ... ... ... conf/vldb/Frank81 ... ... ... ... ... conf/sigmod/Guttman84 conf/btw/HarderR85 ... ... journals/tods/NievergeltHS84 conf/sigmod/Orenstein86 ... ... ... journals/tods/StonebrakerWKH76 conf/sigmod/Tamminen82 journals/ibmsj/Zloof77