Patterns in trees☆
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A preliminary version of this paper was presented at the Ninth Colloquium on Trees in Algebra and Programming, Bordeaux, France (March 1984). This research was supported in part by the National Science Foundation under grant DCR 85-13417, and by the Fund for Research in Electronics, Computers and Communications administered by the Israeli Academy of Sciences and Humanities.
Copyright © 1989 Published by Elsevier B.V.