@misc{Dąbrowski_Mirosław_Analysis,
 author={Dąbrowski, Mirosław and Kondratek, Bartosz},
 howpublished={online},
 publisher={Educational Research Institute},
 language={pol},
 type={article},
 title={Analysis of the effects of an educational package “We play pictograms”},
 keywords={mathematical education, teaching style, IRT modeling, multilevel regression, cluster-randomized experiment},
}