[1] G. Birkhoff: Lattice theory. New York, 1967. MR 0227053 | Zbl 0153.02501

[2] N. Bourbaki: Topologie générale. 2nd ed. Paris 1951.

[3] G. Grätzer J. Plonka A. Sekanina: On the number of polynomials of a universal algebra I. Coll. Math. XXII (1970), 9-11. MR 0294216

[4] E. Marczewski: Independence in abstract algebras, results and problems. Col. Math. XIV (1966), 169-188. DOI 10.4064/cm-14-1-169-188 | MR 0184890 | Zbl 0192.09502

[5] A. S. Pontrjagin: Topological groups. Moscow, 1954.

[6] M. Sekanina: Number of polynomials in ordered algebras. Coll. Math. XXII (1971), 181 -192. MR 0282905 | Zbl 0233.06006

[7] A. Sekaninová M. Sekanina: On the number of polynomials in ordered algebras. Czech. Math. Journal 21 (96), (1971), 391-398. MR 0304266

[8] K. Urbanik: On algebraic operations in idempotent algebras. Col. Math., XIII (1965), 129-157. MR 0179119 | Zbl 0132.25903