no. 2
On the structure of dual semigroups
Séminaire Dubreil. Algèbre et théorie des nombres, Tome 23 (1969-1970) no. 2, Exposé no. DG 2, 5 p. 
@article{SD_1969-1970__23_2_A2_0,
     author = {Schwarz, \v{S}tefan},
     title = {On the structure of dual semigroups},
     journal = {S\'eminaire Dubreil. Alg\`ebre et th\'eorie des nombres},
     note = {talk:DG 2},
     pages = {DG1--DG5},
     publisher = {Secr\'etariat math\'ematique},
     volume = {23},
     number = {2},
     year = {1969-1970},
     zbl = {0228.20038},
     language = {en},
     url = {http://www.numdam.org/item/SD_1969-1970__23_2_A2_0/}
}
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Schwarz, Štefan. On the structure of dual semigroups. Séminaire Dubreil. Algèbre et théorie des nombres, Tome 23 (1969-1970) no. 2, Exposé no. DG 2, 5 p. http://www.numdam.org/item/SD_1969-1970__23_2_A2_0/

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[2] Numakura (K.). - Compact dual semigroups without nilpotent ideals, Duke math. J., t. 31, 1964, p. 555-574. | MR | Zbl

[3] Schwarz (Š.). - On dual semigroups, Czech. math. J. , t. 10, 1960, p. 201-230. | MR | Zbl

[4] Schwarz (Š.). - Prime ideals and maximal ideals in semigroups, Czech. math. J., t. 19, 1969, p. 72-79. | MR | Zbl

[5] Schwarz (Š.). - On the structure of dual semigroups, Czech. math. J. (to appear). | MR | Zbl