Guillermo Badia, Ronald Fagin, et al.
Bulletin of Symbolic Logic
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.
Guillermo Badia, Ronald Fagin, et al.
Bulletin of Symbolic Logic
Allan Borodin, Ronald Fagin, et al.
Journal of Symbolic Computation
Ronald Fagin, Malcolm C. Easton
Journal of the ACM
Ronald Fagin, Joseph Y. Halpern
Journal of the ACM