@article{10_14708_dm_v7i01_6909,
     author = {Hans Freudenthal},
     title = {Co znacz\k{a} struktury naukowe i struktura nauki w rozwoju poznawczym i w nauczaniu},
     journal = {Didactica Mathematicae},
     pages = { 27--42},
     publisher = {mathdoc},
     volume = {7},
     number = {01},
     year = {1987},
     doi = {10.14708/dm.v7i01.6909},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v7i01.6909/}
}