[1] AБPГAH И.: 
O мaкcимaльныx пoдaльгeбpax в yнapныx aльгeбpax. Mat. čas. 24, 1974, 113-128. 
MR 0387156 
[3] FABRICI I., MACKO T.: 
On bases and maximal ideals in semigroups. Math. Slovaca, 31, 1981, 115-120. 
MR 0611622 | 
Zbl 0461.20045 
[4] SCHWARZ Š.: 
Prime ideals and maximal ideals in semigroups. Czechoslov. Math. J. 12, 1969, 72-79. 
MR 0237680 | 
Zbl 0176.29503 
[6] TAMURA T.: 
One-sided bases and translations of a semigroup. Math. Japan 3, 1955, 157-168. 
MR 0078378 | 
Zbl 0067.25707