[1] A. Anjaneyulu: Primary ideals in semigroups. Semigroup Forum 20 (1980), 129–144. DOI 10.1007/BF02572675 | MR 0579722 | Zbl 0441.20041

[2] A. Anjaneyulu: On primary semigroups. Czechoslovak Math. J. 30 (105) (1980), 382–386. MR 0583619 | Zbl 0447.20045

[3] J. Bosák: On radicals of semigroups. Mat. Časop. 18 (1968), 204–212. MR 0240226

[4] J. M. Howie: An Introduction to Semigroup Theory. Academic Press, 1976. MR 0466355 | Zbl 0355.20056

[5] H. Lai: Commutative semi-primary semigroups. Czechoslovak Math. J. 25 (100) (1975), 1–3. MR 0369579

[6] M. Pertrih: Introduction to Semigroups. Merill, Ohio, USA, 1973.

[7] B. Pondělíček: On weakly commutative semigroups. Czechoslovak Math. J. 25 (100) (1975), 20–23. MR 0387460

[8] M. Satyanarayana: Commutative primary semigroups. Czechoslovak Math. J. 22 (97) (1972), 509–516. MR 0308304 | Zbl 0248.20072

[9] M. Satyanarayana: Structure and ideal theory of commutative semigroups. Czechoslovak Math. J. 28 (103) (1978), 171–180. MR 0480802 | Zbl 0389.20050

[10] S. Schwarz: Prime ideals and maximal ideals in semigroups. Czechoslovak Math. J. 29 (94) (1969), 72–79. MR 0237680 | Zbl 0176.29503

[11] O. Zariski and P. Samuel: Commutative Algebra, vol 1. Von Nostrand, Princeton, 1958. MR 0090581