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Lajos Sándor: Contributions to the ideal theory of semigroups. In: Acta scientiarum mathematicarum, (42) 1-2. pp. 117-120. (1980)
Lajos Sándor: Characterizations of completely regular elements in semigroups. In: Acta scientiarum mathematicarum, (40) 3-4. pp. 297-300. (1978)
Lajos Sándor: A note on semilattices of groups. In: Acta scientiarum mathematicarum, (33) 3-4. pp. 315-317. (1972)
Lajos Sándor; Szász Ferenc: Bi-ideals in associative rings. In: Acta scientiarum mathematicarum, (32) 1-2. pp. 185-193. (1971)
Lajos Sándor: Characterization of completely regular inverse semigroups : To Professor L. Rédei on his seventieth birthday. In: Acta scientiarum mathematicarum, (31) 3-4. pp. 229-231. (1970)
Lajos Sándor: On (m, n)-ideals in regular duo semigroups. In: Acta scientiarum mathematicarum, (31) 1-2. pp. 179-180. (1970)
Lajos Sándor; Szász Ferenc: Some characterizations of two-sided regular rings : To Professor L. Rédei on his seventieth birthday. In: Acta scientiarum mathematicarum, (31) 3-4. pp. 223-228. (1970)
Lajos Sándor: On semigroups which are semilattices of groups. In: Acta scientiarum mathematicarum, (30) 1-2. pp. 133-135. (1969)
Lajos Sándor: A note on completely regular semigroups. In: Acta scientiarum mathematicarum, (28) 3-4. pp. 261-265. (1967)
Lajos Sándor: A criterion for Neumann regularity of normal semigroups. In: Acta scientiarum mathematicarum, (25) 1-2. pp. 172-173. (1964)
Lajos Sándor: Generalized ideals in semigroups. In: Acta scientiarum mathematicarum, (22) 3-4. pp. 217-222. (1961)
Lajos Sándor: Über die diuretische Wirkung des "Novurit". In: Acta Litterarum ac Scientiarum Regiae Universitatis Hungaricae Francisco-Josephinae : sectio medicorum, (4). pp. 97-105. (1929)
