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- Relation between self-concept, motivation for education and academic achievement: A slovenian case / Darja Kobal Grum, Nada Lebarič, Janez Kolenc . Studia psychologica : an international journal for research and theory in psychological sciences : časopis pre výskum a teóriu v psychologických vedách. - ISSN 0039-3320 . - Vol. 46, no. 2 (2004), s. 105-126 : Obr., tab.
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- Self-concept and competitiveness in three national cultures / Darja Kobal Grum, Janez Kolenc . Studia psychologica : an international journal for research and theory in psychology : časopis pre výskum a teóriu v psychológii. - ISSN 0039-3320 . - Vol. 50, no. 3 (2008), s. 291-309 : ilustr., grafy, tab.
- C 1890