%P 243-253 %C Szeged %O Bibliogr.: p. 252-253. ; ĂśsszefoglalĂĄs angol nyelven %T Regularizing context-free languages by AFL operations : concatenation and Kleene closure %J Acta cybernetica %A Dassow JĂźrgen %A Mateescu Alexandru %A Paun G. %A Salomaa A. %N 4 %D 1992 %L acta12510 %K SzĂĄmĂtĂĄstechnika, Kibernetika %V 10 %X We consider the possibility to obtain a regular language by applying a given operation to a context-free language. Properties of the family of context-free languages which can be "regularized'1 by concatenation with a regular set or by Kleene closure are investigated here: size, hierarchies, characterizations, closure, decidability.