@article{10_14708_dm_v25i01_6650,
     author = {Lidia Zar\k{e}ba},
     title = {Z bada\'n nad procesem uog\'olniania i stosowaniem w nim symbolu literowego przez uczni\'ow w wieku 10-14 lat},
     journal = {Didactica Mathematicae},
     pages = { 151--181},
     publisher = {mathdoc},
     volume = {25},
     number = {01},
     year = {2003},
     doi = {10.14708/dm.v25i01.6650},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v25i01.6650/}
}