conf/sigmod/75 Mario Schkolnick Secondary Index Optimization. 186-192 1975 SIGMOD Conference db/conf/sigmod/sigmod75.html#Schkolnick75 http://doi.acm.org/10.1145/500080.500106 db/conf/sigmod/Schkolnick75.html SIGMOD75/P186.PDF ... ... conf/sigmod/ChamberlinB74 journals/cacm/Codd70 ... ... ... ... ... journals/is/Schkolnick75 ...