@article{10_14708_dm_v27i01_6642,
     author = {Lidia Zar\k{e}ba},
     title = {Proces uog\'olniania w matematyce i stosowanie w nim symbolu literowego u uczni\'ow w wieku 13-14 lat},
     journal = {Didactica Mathematicae},
     pages = { 281--290},
     publisher = {mathdoc},
     volume = {27},
     number = {01},
     year = {2004},
     doi = {10.14708/dm.v27i01.6642},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v27i01.6642/}
}