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Bibliography

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Garrett Birkhoff, Lattice theory, Amer. Math. Soc. Colloquium Publications, vol. 25, rev. ed., 1948. MR 0029876 (10:673a)

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R. Courant and H. Robbins, What is mathematics?, Oxford University Press, New York, 1941. MR 0005358 (3:144b)

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E. Pitcher and M. F. Smiley, Transitivities of betweenness, Trans. Amer. Math. Soc. vol. 52 (1942) pp. 95-114. MR 0007099 (4:87d)

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Marlow Sholander, Tress, lattices, order, and betweenness, Proc. Amer. Math. Soc. vol. 3 (1952) pp. 369-381. MR 0048405 (14:9b)

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-, Medians, lattices, and trees, Proc. Amer. Math. Soc. vol. 5 (1954) pp. 808-812. MR 0064750 (16:329b)