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References:
[1] Nebeský L.: Algebraic Properties of Trees. Acta Univ. Carol. Philologica - Monographia XXV, 1969. MR 0274210
[2] Ore O.: Theory of Graphs. Providence 1962. MR 0150753 | Zbl 0105.35401
[3] Zelinka В.: Intersection graphs of trees and tree algebras. Math. Slovaca 26 (1976), 343-350. MR 0434857 | Zbl 0367.05028
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