Learnability and definability in trees and similar structures
Martin Grohe
and Gyorgy Turán
Proc. 19th Symp. Theoretical Aspects of Computer Science (STACS 2002), Lecture Notes in Computer Science 2285, Springer-Verlag, 2002, pp. 645–658
http://www.informatik.hu-berlin.de/~grohe/pub/vc.ps
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