conf/sigmod/85 James Clifford Abdullah Uz Tansel On An Algebra For Historical Relational Databases: Two Views. 247-265 1985 SIGMOD Conference db/conf/sigmod/sigmod85.html#CliffordT85 SIGMOD85/P247.PDF http://doi.acm.org/10.1145/318898.318922 db/conf/sigmod/CliffordT85.html ... conf/sigmod/AriavCJ83 ... ... ... journals/sigmod/BolourADW82 ... ... journals/tods/CliffordW83 journals/cacm/Codd70 journals/tods/Codd79 conf/vldb/DadamLW84 ... conf/sigmod/HammerM78 conf/pods/JaeschkeS82 conf/er/Klopprogge81 conf/vldb/KlopproggeL83 journals/jacm/Klug82 conf/sigmod/LumDEGPWWW84 ... conf/sigmod/Sciore79 conf/pods/Snodgrass84