[1] BENADO M.: Les ensembles partiellement ordonnées et le théorème de raffinement de Schreier, II. Théorie des multistructures, Czech. Math. J., 5 (80), 1955, 308-344. MR 0076744

[2] JAKUBÍK J.: On isomorphisms ofgraphs of lattices. Czech. Math. J. (to appear).

[3] JAKUBÍK J.: Grafový izomorfizmus multizväzov. Acta Fac. Rer. Nat. Univ. Comenianae Math., V 1956, 255-264. MR 0096597

[4] KOLIBIAR M.: Über direkte Produkte von Relativen. Acta Fac. Rer. Nat. Univ. Comenianae Math., 10, 1965, 1-9. MR 0202652 | Zbl 0136.26002

[5] KOLIBIAR M.: Graph isomorphisrns of semilattices. Proc. of the Vienna Conf. June 21-24 1984, Contributions to General Algebra (1985), 225-235. MR 0815129

[6] TOMKOVÁ M.: On multilattices with isomorphic graphs. Math. Slovaca, 32, 1982, 63-73. MR 0648222 | Zbl 0496.06005