conf/sigmod/88 Andreas Hutflesz Hans-Werner Six Peter Widmayer Twin Grid Files: Space Optimizing Access Schemes. 183-190 1988 SIGMOD Conference db/conf/sigmod/sigmod88.html#HutfleszSW88 http://doi.acm.org/10.1145/50202.50222 db/conf/sigmod/HutfleszSW88.html SIGMOD88/P183.PDF journals/acta/BayerM72 journals/tods/FaginNPS79 conf/sigmod/FaloutsosSR87 conf/sigmod/Freeston87 conf/sigmod/Guttman84 ... conf/icde/HutfleszSW88 conf/edbt/HutfleszSW88 conf/icdt/KriegelS86 ... conf/vldb/Lomet81 journals/tods/Lomet87 journals/tods/NievergeltHS84 conf/pods/Otoo86 journals/tods/RamamohanaraoS84 conf/sigmod/Robinson81 conf/vldb/SellisRF87 conf/icde/SixW88