@article{10_14708_dm_v20i01_6752,
     author = {Marianna Ciosek and Maciej Klakla},
     title = {CIEAEM 50},
     journal = {Didactica Mathematicae},
     pages = { 121--127},
     publisher = {mathdoc},
     volume = {20},
     number = {01},
     year = {1998},
     doi = {10.14708/dm.v20i01.6752},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v20i01.6752/}
}