@article{10_14708_dm_v36i0_694,
     author = {Piotr Zarzycki},
     title = {Wybrane z {Math} {Educ} i z {ZDM,} cz\k{e}\'s\'c {XVIII}},
     journal = {Didactica Mathematicae},
     publisher = {mathdoc},
     volume = {36},
     year = {2014},
     doi = {10.14708/dm.v36i0.694},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v36i0.694/}
}