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Спасојевић П, Симеуновић В. COMBINED CLASSES – PEDAGOGIC CHALLENGE OF CONTEMPORARY EDUCATIONAL SYSTEM (How to preserve small countryside schools?). ns [Internet]. 2012 Dec. 30 [cited 2026 May 6];7(1):26-4. Available from: https://novaskola.pfb.ues.rs.ba/index.php/ns/article/view/548