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- Effect of number structure and nature of quantities on secondary school students' proportional reasoning / Ceneida Fernández ... [et al.] . Studia psychologica : an international journal for research and theory in psychology : časopis pre výskum a teóriu v psychológii. - ISSN 0039-3320 . - Vol. 53, no. 1 (2011), s. 69-81 : ilustr., tab.
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