The Theory of Joins in Relational Databases.

Alfred V. Aho Catriel Beeri Jeffrey D. Ullman The Theory of Joins in Relational Databases. 297-314 TODS4/P297.PDF 1979 4 ACM Trans. Database Syst. 3 db/journals/tods/tods4.html#AhoBU79 http://doi.acm.org/10.1145/320083.320091 db/journals/tods/AhoBU79.html books/aw/AhoHU74 conf/ifip/Armstrong74 conf/vldb/AroraC78 journals/tods/Beeri80 conf/vldb/BeeriBG78 journals/tods/Bernstein76 ... conf/sigmod/BeeriFH77 conf/sigmod/CarlsonK76 journals/cacm/Codd70 persons/Codd71a conf/ifip/Codd74 ... ... journals/tods/Fagin77 ... conf/adbt/MaierMSU79 conf/vldb/Manacher75 journals/tods/Rissanen77 journals/siamcomp/Tarjan72 ...