This link leads to a reasonably complete preliminary version of this chapter. The final published article can be found in

L. Babai: Automorphism Groups, Isomorphism, Reconstruction. Chapter 27 of the Handbook of Combinatorics, R. L. Graham, M. Grötschel, L. Lovász, editors, North Holland - Elsevier, 1995, Volume 2, pp. 1447--1540.

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