Geodesic
Counting word-trees
Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 148-149

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In his recent study of free inverse semigroups, Munn [2] introduced and used extensively the concept of a word-tree. In this note the number of such trees is found. 
Mitchell, J. M. O. Counting word-trees. Glasgow mathematical journal, Tome 15 (1974) no. 2, pp. 148-149. doi: 10.1017/S0017089500002317
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[1] 1.Harary, F., Graph theory (Reading, Mass., 1969). Google Scholar | DOI

[2] 2.Munn, W. D., Free inverse semigroups, Proc. London Math. Soc.; to appear. Google Scholar

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