Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{UM_1993__1_4_a18, author = {Odv\'arko, O.}, title = {Kdo \v{s}et\v{r}{\'\i} m\'a za t\v{r}i}, journal = {U\v{c}itel matematiky}, pages = {50--52}, publisher = {mathdoc}, volume = {01}, number = {4}, year = {1993}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/UM_1993__1_4_a18/} }
Odvárko, O. Kdo šetří má za tři. Učitel matematiky, Tome 01 (1993) no. 4, pp. 50-52. http://geodesic.mathdoc.fr/item/UM_1993__1_4_a18/