[1] CLIFFORD A. H., PRESTON G. B.: The algebraic theory of semigroups. Volume II. Amer. Math. Soc, Providence, R. I. 1967. MR 0218472 | Zbl 0178.01203

[2] ABRHAN I.: O максимальных подалгебрах в унарных влгебрах. Mat. čas., 24, 1974, 113-128. MR 0387156

[3] GRILLET P. A.: Intersections of maximal ideals in semigroups. Amer. Math. Monthly, 76, 1969, 503-509. MR 0248254 | Zbl 0191.01603

[4] SCHWARZ Š.: Prime ideals and maximal ideals in semigroups. Czechoslovak Math. J., 19, 1969, 72-79. MR 0237680 | Zbl 0176.29503

[5] SCHWARZ Š.: The ideal structure of C-semigroups. Czechoslovak Math. J., 27, 1977, 313-338. MR 0439961 | Zbl 0376.20038

[6] SATYANARAYANA M.: On a class of semisimple semigroups. Semigroup Forum, 10, 1975, 129-138. MR 0382514 | Zbl 0303.20043