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ADDITIVE ENUMERATION PROBLEMS OVER TREES
王振宇
数学物理学报(英文版). 1983 (4):
445-453.
The autaor in his previous papers obtained a series of results about some enumeration (or, combinatorial) problems over trees, such as binary trees, t-ary trees, ordered trees.and oriented trees. The purpose of this paper is to develop a unified scheme dealing with these problems. He introduced the concept, so-called additive enumeration problems,to cover a wide class of enumeration problems over trees.
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