conf/pods/91 Richard Helm Kim Marriott Martin Odersky Constraint-Based Query Optimization for Spatial Databases. 181-191 1991 PODS db/conf/pods/pods91.html#HelmMO91 http://doi.acm.org/10.1145/113413.113429 journals/anthology/cd1-3:PODS91/P181.PDF journals/anthology/dvd1:text/1-3/PODS91/P181.PDF ... ... ... ... ... conf/sigmod/Guttman84 ... journals/tse/JosephC88 journals/tods/NievergeltHS84 journals/tse/OrensteinM88 ... journals/csur/Samet88 conf/vldb/SellisRF87 ...