@article{10_14708_dm_v29i01_6543,
     author = {Piotr Zarzycki},
     title = {Wybrane z {ZDM,} cz\k{e}\'s\'c {XII}},
     journal = {Didactica Mathematicae},
     pages = { 311--317},
     year = {2006},
     volume = {29},
     number = {01},
     doi = {10.14708/dm.v29i01.6543},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v29i01.6543/}
}