[1] F. Catino: On complete $\alpha $-ideals in semigroups. Czech. Math. J. 40(115) (1990), 155–158. MR 1037353 | Zbl 0704.20048

[2] A. G. Kurosh: Lectures on general algebra. Chelsea, New York, 1963. MR 0158000

[3] M. M. Miccoli and B. Pondělíček: On $\alpha $-ideals and generalized $\alpha $-ideals in semigroups. Czech. Math. J. 39(114) (1989), 522–527. MR 1006318

[4] J. D. Monk and F. M. Sioson: $m$-Semigroups, semigroups and function representations. Fund. Math. 59 (1966), 233–241. DOI 10.4064/fm-59-3-233-241 | MR 0206133

[5] J. D. Monk and F. M. Sioson: On the general theory of $m$-groups. Fund. Math. 72 (1971), 233–244. DOI 10.4064/fm-72-3-233-244 | MR 0294219

[6] E. I. Sokolov: On the Gluskin-Hosszú theorem on the Dörnte $n$-groups (Russian). Mat. Issled. 39 (1976), 187–189. MR 0442135

[7] R. Šulka: On principal generalized $\alpha $-ideals and maximal principal generalized $\alpha $-ideals in the direct product of semigroups. PU.M.A. Ser. A 3(1) (1992), 3–8. MR 1217463