@article{10_14708_dm_v15i01_6799,
     author = {Ewa Swoboda},
     title = {Pr\'oba hierarchizacji trudno\'sci zada\'n na powi\k{e}kszanie figur na etapie przeddefinicyjnym poj\k{e}cia podobie\'nstwa},
     journal = {Didactica Mathematicae},
     pages = { 85--101},
     publisher = {mathdoc},
     volume = {15},
     number = {01},
     year = {1993},
     doi = {10.14708/dm.v15i01.6799},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v15i01.6799/}
}