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References > Regular Expressions - Pg. 765

rEFErENCES 765 Missing Values Codd, E. F. (1975). Understanding relations. FDT, 7, 3­4. Grahne, G. (1989). Horn tables--an efficient tool for handling incom- plete information in databases. ACM SIGACT/SIGMOD/SIGART Symposium on Principles of Database Systems, 75­82. Grant, J. (1977). Null values in relational databases. Information Processing Letters, 6(5). Grant, J. (1979). Partial values in a tabular database model. Information Processing Letters, 6(5). Honeyman, P. (1980). Functional dependencies and the universal instance property in the relational model of database systems. Doctoral Dissertation, Princeton University. Lien, Y. E. (1979). Multivalued dependencies with null values in relation- al databases. VLDB V, Rio De Janeiro. ACM/IEEE. Lipski, W. (1981a). On semantic issues connected with incomplete informa- tion. ACM Transactions on Database Systems, 262­296. Lipski, W. (1981b). On databases with incomplete information. Journal of the ACM, 28(1), 41­47. McGoveran, D. (1993). Nothing from nothing part I (or, what's logic got to do with it?). Database Programming and Design, 6(12), 32. [A four