Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{UM_2002__10_1_a8, author = {Zelinka, Bohdan}, title = {Pozn\'amky o ne\v{r}e\v{s}iteln\'ych \'uloh\'ach ve \v{s}kole}, journal = {U\v{c}itel matematiky}, pages = {52--53}, publisher = {mathdoc}, volume = {10}, number = {1}, year = {2002}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/UM_2002__10_1_a8/} }
Zelinka, Bohdan. Poznámky o neřešitelných úlohách ve škole. Učitel matematiky, Tome 10 (2002) no. 1, pp. 52-53. http://geodesic.mathdoc.fr/item/UM_2002__10_1_a8/