6Blanning R W. A relational framework for join implementation in model management systems[J]. Decision Support Systems, 1985,1(1):69-81.
7Bonczek R, Holsapple C, Whinston A. Foundations of Decision Support Systems[M]. New York: Academic Press, 1981.
8Dolk D K, Konsynski B R. Knowledge representation for model management systems[ J]. IEEE Transactions on Software Engineering, SE-10. 1984, (6): 619-628.
