Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{UM_1998__6_4_a5, author = {Leischner, Pavel}, title = {Heron\r{u}v vzorec je\v{s}t\v{e} jednou}, journal = {U\v{c}itel matematiky}, pages = {230--233}, publisher = {mathdoc}, volume = {06}, number = {4}, year = {1998}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/UM_1998__6_4_a5/} }
Leischner, Pavel. Heronův vzorec ještě jednou. Učitel matematiky, Tome 06 (1998) no. 4, pp. 230-233. http://geodesic.mathdoc.fr/item/UM_1998__6_4_a5/