@article{10_14708_dm_v31i0_20,
     author = {Piotr Zarzycki},
     title = {Wybrane z {ZDM,} cz\k{e}\'sc {XIV}},
     journal = {Didactica Mathematicae},
     publisher = {mathdoc},
     volume = {31},
     year = {2008},
     doi = {10.14708/dm.v31i0.20},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v31i0.20/}
}