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Литература
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| 1. |
G. Birkhoff, Lattice Theory, 25, Amer. Math. Soc., Coll. Publ., Providence, RI, 1967   |
| 2. |
FR. T., Jr. Christoph, “Ideal extensions of topological semigroup”, Canad. J. Math., 22:6 (1970), 1168–1175  |
| 3. |
A. H. Clifford, “Extensions of semigroups”, Trans. Amer. Math. Soc., 68 (1950), 165–173 |
| 4. |
A. H. Clifford, G. B. Preston, The algebraic theory of semigroups, V. 1, Math. Surveys, 7, Amer. Math. Soc., Providence, RI, 1977 |
| 5. |
J. A. Hildebrant, “Ideal extensions of compact reductive semigroups”, Semigroup Forum, 25 (1982), 283–290 |
| 6. |
A. J. Hulin, “Extensions of ordered semigroups”, Semigroup Forum, 2 (1971), 336–342 |
| 7. |
A. J. Hulin, “Extensions of ordered semigroups”, Czech. Math. J., 26(101):1 (1976), 1–12 |
| 8. |
N. Kehayopulu, P. Kiriakuli, “The ideal extensions of lattices”, Simon Stevin, 64:1 (1990), 51–60 |
| 9. |
N. Kehayopulu, M. Tsingelis, “Ideal extensions of ordered semigroups”, Commun. Algebra, 31:10 (2003), 4939–4969 |
| 10. |
N. Kehayopulu, “Ideal extensions of ordered sets”, Int. J. Math. Sci., 53 (2004), 2847–2861 |
| 11. |
N. Kehayopulu, K. P. Shum, “Equivalent extensions of ordered sets”, Algebras, Groups and Geometries, 20:4 (2003), 387–402 |
| 12. |
M. Petrich, Introduction to Semigroups, Charles E. Merrill Publishing Company, Columbus, Ohio, 1973 |
