@article{10_14708_dm_v11i01_6856,
     author = {Hans Freudenthal},
     title = {B{\l}\k{e}dy nauczyciela - analiza dydaktyczna samego siebie},
     journal = {Didactica Mathematicae},
     pages = { 109--115},
     publisher = {mathdoc},
     volume = {11},
     number = {01},
     year = {1989},
     doi = {10.14708/dm.v11i01.6856},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v11i01.6856/}
}