1. V. V. Vagner, “Generalized groups,” Dokl. Akad. Nauk SSSR,
84, No. 6, 1119–1122 (1952).
2. A. D. Taimanov, "On the topologization of commutative semigroups," Mat. Zametki, 17, No. 5, 745-748 (1975)
3. English translation: Math. Notes, 17, No. 5, 443-444 (1975).
4. A. D. Taimanov, “An example of a semigroup which admits only the discrete topology,” Algebra Logika, 12, No. 1, 114–116; English translation:
Algebra Logic,
12, No. 1, 64–65 (1973).
5. K. R. Ahre, “Locally compact bisimple inverse semigroups,” Semigroup Forum,
22, No. 1, 387–389 (1981),
https://doi.org/10.1007/BF02572817
.