@article{10_14708_dm_v5i01_6947,
     author = {Josette Adda},
     title = {Obserwacja lekcji i paradoks obserwatora},
     journal = {Didactica Mathematicae},
     pages = { 49--66},
     publisher = {mathdoc},
     volume = {5},
     number = {01},
     year = {1985},
     doi = {10.14708/dm.v5i01.6947},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v5i01.6947/}
}