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References:
[1] G. BIRKHOFF: Lattice Theory. Am. Math. Soc. Colloquium Publications, vol. XXV, New York 1948. MR 0029876 | Zbl 0033.10103
[2] O. ORE: Theory of Graphs. Am. Math. Soc. Colloquium Publications, vol. XXXVIII, Providence 1962. MR 0150753 | Zbl 0105.35401
[3] L. NEBESKÝ: Algebraic Properties of Trees. AUC Philologica Monographia XXV, Universita Karlova, Praha 1969. MR 0274210
[4] L. NEBESKÝ: Algebraické vlastnosti stromů. manuscript, 1969.
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