The Role Concept in Data Models.

conf/vldb/77 Charles W. Bachman Manilal Daya The Role Concept in Data Models. 464-476 1977 VLDB db/conf/vldb/vldb77.html#BachmanD77 VLDB77/P464.PDF ... ... ... conf/sigmod/BachmanB72 ... journals/tods/Chen76 ... ... journals/cacm/Codd70 ... ... ... ... ... conf/vldb/KerschbergKT76 conf/sigmod/SchmidS75 ... ...