Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{UM_1997__5_1_a4, author = {Calda, Emil}, title = {Jak\'a je rovnice kruhu?}, journal = {U\v{c}itel matematiky}, pages = {22--25}, publisher = {mathdoc}, volume = {05}, number = {1}, year = {1997}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/UM_1997__5_1_a4/} }
Calda, Emil. Jaká je rovnice kruhu?. Učitel matematiky, Tome 05 (1997) no. 1, pp. 22-25. http://geodesic.mathdoc.fr/item/UM_1997__5_1_a4/