@misc{Benesova_Ludmila_Geometrical_2011,
 author={Benesova, Ludmila and Tlaskal, Jakub and Molnar, Josef and Slezakova, Jana},
 type={artykuł},
 publisher={Wydawnictwo Akademii im. Jana Długosza w Częstochowie},
 title={Geometrical imagination and knowledge of triangles at elementary schools},
 address={Częstochowa},
 year={2011},
 language={eng},
}