Conference paper
Multi-Structural Databases
Ronald Fagin, R. Guha, et al.
SIGMOD/PODS/ 2005
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, R. Guha, et al.
SIGMOD/PODS/ 2005
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ACM TODS
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ICDT 2012
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Journal of the ACM