Ronald Fagin
ACM Transactions on Database Systems (TODS)
An elementary proof is presented of an asymptotic estimate for the number (up to isomorphism) of finite relational structures, under a quite general definition of "relational structure". © 1977.
Ronald Fagin
ACM Transactions on Database Systems (TODS)
Ronald Fagin, Joseph Y. Halpern, et al.
Information and Computation
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Artificial Intelligence
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STOC 1981