@article{10_14708_dm_v10i01_6870,
     author = {Anna Zofia Krygowska},
     title = {CIEAEM 39},
     journal = {Didactica Mathematicae},
     pages = { 149--160},
     publisher = {mathdoc},
     volume = {10},
     number = {01},
     year = {1989},
     doi = {10.14708/dm.v10i01.6870},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v10i01.6870/}
}