TY - GEN A1 - Bieniek, Piotr L2 - http://pbc.up.krakow.pl/Content/1568 KW - chemia KW - dydaktyka chemii T1 - From gymnasium students' point of view, are there any unsolved problems in chemistry? UR - http://pbc.up.krakow.pl/dlibra/publication/edition/1568 ER -