@article{10_14708_dm_v31i0_17,
     author = {Miros{\l}awa Sajka},
     title = {Mathematical problems designed with the use of functional equations as theoretical tools for examining subject matter knowledge of functions},
     journal = {Didactica Mathematicae},
     publisher = {mathdoc},
     volume = {31},
     year = {2008},
     doi = {10.14708/dm.v31i0.17},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/dm.v31i0.17/}
}