Gál-Szabó Zsófia és Korom Erzsébet (2018): Combinatorial reasoning in 4th and 6th grade pupils: Preliminary results of a large-scale study. In: Vidákovich Tibor and Fűz Nóra (eds.): CEA 2018 16th Conference on Educational Assessment. 26th–28th April 2018.

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Gál-Szabó Zsófia és Korom Erzsébet (2018): Combinatorial reasoning in 4th and 6th grade pupils: Preliminary results of a large-scale study. In: Vidákovich Tibor and Fűz Nóra (eds.): CEA 2018 16th Conference on Educational Assessment. 26th–28th April 2018. Programme and abstracts. Doctoral School of Education, Szeged. 37.