@article{10_14708_dm_v20i01_6753,
     author = {. Redakcja},
     title = {CIEAEM 51},
     journal = {Didactica Mathematicae},
     pages = { 127},
     publisher = {mathdoc},
     volume = {20},
     number = {01},
     year = {1998},
     doi = {10.14708/dm.v20i01.6753},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v20i01.6753/}
}