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Schwarz Štefan: A note on small categories with zero. In: Acta scientiarum mathematicarum, (35). pp. 161-164. (1973)
Schwarz Štefan: On the index of imprimitivity of a non-negative matrix. In: Acta scientiarum mathematicarum, (28) 1-2. pp. 185-189. (1967)
Schwarz Štefan: Semigroups in which every proper subideal is a group : To Professor L. Redei on the occasion of his sixtieth birthday. In: Acta scientiarum mathematicarum, (21) 3-4. pp. 125-134. (1960)
Schwarz Štefan: An elementary semigroup theorem and a congruence relation of Rédei. In: Acta scientiarum mathematicarum, (19) 1-2. pp. 1-4. (1958)
Schwarz Štefan: On a type of universal forms in discretely valued fields. In: Acta scientiarum mathematicarum, (17). pp. 5-29. (1956)