Philip W. Trinder Comprehensions, a Query Notation for DBPLs. 55-68 DBPL1991/P055.pdf 1991 DBPL db/conf/dbpl/dbpl91.html#Trinder91 conf/dbpl/91 db/conf/dbpl/Trinder91.html conf/dbpl/AbiteboulG87 journals/tods/AlbanoCO85 ... journals/csur/AtkinsonB87 conf/ewdw/AtkinsonRT90 conf/vldb/BancilhonBKV87 ... journals/tods/BunemanFN82 persons/Codd72 books/aw/Date86 ... ... conf/fpca/Hughes85 ... conf/sigmod/LecluseRV88 ... conf/dbpl/MatthesS91 ... ... conf/dbpl/Nikhil87 ... conf/bncod/Poulovassilis88 ... ... ... ... ... ... ... conf/lfp/Wadler90 ... books/cs/Ullman80