Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{UM_1998__6_1_a3, author = {Calda, Emil}, title = {Zn\'am\'a rovnost v souvislostech asi nezn\'am\'ych}, journal = {U\v{c}itel matematiky}, pages = {18--21}, publisher = {mathdoc}, volume = {06}, number = {1}, year = {1998}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/UM_1998__6_1_a3/} }
Calda, Emil. Známá rovnost v souvislostech asi neznámých. Učitel matematiky, Tome 06 (1998) no. 1, pp. 18-21. http://geodesic.mathdoc.fr/item/UM_1998__6_1_a3/