Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1988__29_1_a8, author = {Loebl, Martin}, title = {Hercules and {Hydra}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {85--95}, publisher = {mathdoc}, volume = {29}, number = {1}, year = {1988}, mrnumber = {937552}, zbl = {0666.05024}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1988__29_1_a8/} }
Loebl, Martin. Hercules and Hydra. Commentationes Mathematicae Universitatis Carolinae, Tome 29 (1988) no. 1, pp. 85-95. http://geodesic.mathdoc.fr/item/CMUC_1988__29_1_a8/