conf/sigmod/76 Dennis Tsichritzis LSL: A Link and Selector Language. 123-133 1976 SIGMOD Conference db/conf/sigmod/sigmod76.html#Tsichritzis76 http://doi.acm.org/10.1145/509383.509401 db/conf/sigmod/Tsichritzis76.html SIGMOD76/P123.PDF ... journals/cacm/Codd70 ... conf/sigmod/DateC74 ... ... conf/vldb/RoussopoulosM75 conf/vldb/SchmidB75 journals/cacm/RitchieT74 ... conf/vldb/Tsichritzis75