[1] S. P. Avann:
Metric ternary distributive semi-lattices. Proc. Amer. Math. Soc. 12 (1961), 407-414.
MR 0125807 |
Zbl 0099.02201
[2] H. J. Bandelt J. Hedlíková:
Median algebras. Discrete Math. 45 (1983), 1-30.
MR 0700848
[3] M. Kolibiar T. Marcisová:
On a question of J. Hashimoto. Mat. Časopis 24 (1974), 179-185.
MR 0351939
[4] L. Nebeský:
Algebraic properties of trees. Acta Univ* Carolinae, Philologica Monographia 25, Praha 1969.
MR 0274210
[5] M. Sholander:
Trees, lattices, order, and betweenness. Proc. Amer. Math. Soc. 3 (1952), 369-381.
MR 0048405