Gio Wiederhold Ramez Elmasri The Structural Model for Database Design. 237-258 1979 ER db/conf/er/er79.html#WiederholdE79 conf/er/79 db/conf/er/WiederholdE79.html er79/ER79-P237.pdf conf/ds/Abrial74 journals/tods/AstrahanBCEGGKLMMPTWW76 journals/tse/ChangC78 journals/tods/Chen76 journals/cacm/Codd70 persons/Codd71a ... conf/ifip/Codd74 ... conf/sigmod/El-MasriW79 ... ... journals/csur/FryS76 conf/sigmod/HammerM78 conf/afips/HeldS75 conf/vldb/Kent76 conf/vldb/Manacher75 conf/sigmod/NavatheS78 conf/vldb/Sagalowicz77 journals/tods/SmithS77 ... ... journals/csur/TsichritzisL76 ... ... ... books/mg/Wiederhold77