[1] William H. CORNISH R. C. HICKMAN: Weakly distributive semilattices. Acta Math. Acad. Sci. Hungar. 32 (1978), 5-16. MR 0551490

[2] William H. CORNISH A. S. A. NOOR: Standard elements in a nearlattice. Bull. Austral. Math. Soc. 26 (1982), 185-213. MR 0683652

[3] E. Evans: Median lattices and convex subalgebras. Colloq. Math. Soc. Janos Bolyai, 29, North Holland Amsterdam, New York 1982, 225-240. MR 0660862 | Zbl 0489.08014

[4] Robert HICKMAN: Join algebras. Commun. Alg. 8 (1980), 1653-1685. MR 0585925

[5] J. JAKUBÍK M. KOLIBIAR: On some properties of a pair of lattices. (Russian), Czechoslovak Math. J. 4 (1954), 1-27. MR 0065529

[6] Milan KOLIBIAR: A ternary operation in lattices. (Russian), Czechoslovak Math. J. 6 (1956), 318-329. MR 0099932

[7] A. S. A. NOOR: Isotopes of nearlattices. Ganit. J. Bangladesh Math. Soc. 1 (1) (1981), 63-72. MR 0648685 | Zbl 0585.06001

[8] M. SHOLANDER: Medians, lattices and trees. Proc. Amer. Math. Soc. 5 (1954), 808-812. MR 0064750 | Zbl 0056.26201