Gonda, J. (2009)

Acta Mathematica Academiae Paedagogicae Nyí regyháziensis. New Series [electronic only]

Frank Markham Brown, Sergiu Rudeanu (1986)

Publications de l'Institut Mathématique

Bo Zhou (2004)

Kragujevac Journal of Mathematics

André Arnold (1997)

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

Andrzej Kisielewicz (1988)

Journal für die reine und angewandte Mathematik

Marko Mirković, Janko Hodolič, Dragan Radojević (2006)

The Yugoslav Journal of Operations Research

Dragić Banković (1989)

Publications de l'Institut Mathématique

Dragić Banković (1990)

Publications de l'Institut Mathématique