@article{10_14708_dm_v25i01_6647,
     author = {Agnieszka Demby},
     title = {Kszta{\l}towanie si\k{e} umiej\k{e}tno\'sci przekszta{\l}cania wyra\.ze\'n algebraicznych u uczni\'ow w wieku 13-15},
     journal = {Didactica Mathematicae},
     pages = { 69--109},
     publisher = {mathdoc},
     volume = {25},
     number = {01},
     year = {2003},
     doi = {10.14708/dm.v25i01.6647},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v25i01.6647/}
}