O multiplikatívnej pologrupe zvyškových tried (mod m ) Bohumír Parízek, Štefan Schwarz (1958) Matematicko-fyzikálny časopis
Objets algébriquement clos et injectifs dans les catégories localement présentables Sabah Fakir (1975) Mémoires de la Société Mathématique de France
On A Class Of Anti-Inverse Semigroups Svetozar Milić, Stojan Bogdanović (1979) Publications de l'Institut Mathématique
On a class of semigroups with symmetric presentations. C.M. Campbell, E.F. Robertson, R.M. Thomas (1993) Semigroup forum
On a semigroup theoretic generalization of the Kaluznin Krasner Theorem and normal extensions of inverse semigroups. B. Billhardt (1992) Semigroup forum
On a wreath product embedding and idempotent pure congruences on inverse semigroups. B. Billhardt (1992) Semigroup forum