conf/vldb/91 Walid G. Aref Hanan Samet Optimization for Spatial Query Processing. 81-90 1991 VLDB db/conf/vldb/vldb91.html#ArefS91 db/conf/vldb/ArefS91.html VLDB91/P081.PDF ... conf/ssd/ArefS91 journals/tods/BeckerG92 ... books/bc/ElmasriN89 conf/sigmod/GraefeD87 conf/vldb/Guting89 conf/sigmod/HaasFLP89 journals/csur/JarkeK84 ... conf/sigmod/Orenstein86 ... conf/nf2/SchekS87 ... conf/ssd/Wolf89 journals/tods/WongY76