@article{10_14708_dm_v15i01_6802,
     author = {N. Balacheff and A.G. Howson and A. Sfard and H. Steinbring and J. Kilpatrick and A. Sierpi\'nska.},
     title = {Na czym polegaj\k{a} badania w dydaktyce matematyki i jakie s\k{a} ich wyniki? {(Materia{\l}y} do dyskusji przygotowane w ramach projektu {ICMI} {Study)}},
     journal = {Didactica Mathematicae},
     pages = { 117--124},
     publisher = {mathdoc},
     volume = {15},
     number = {01},
     year = {1993},
     doi = {10.14708/dm.v15i01.6802},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v15i01.6802/}
}