Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MOMA_1972__76_177607, author = {H.G. Helfenstein}, title = {The {Hurwitz} {Relation} for {Tori.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {300--305}, publisher = {mathdoc}, volume = {76}, year = {1972}, zbl = {0248.53007}, url = {http://geodesic.mathdoc.fr/item/MOMA_1972__76_177607/} }
H.G. Helfenstein. The Hurwitz Relation for Tori.. Monatshefte für Mathematik, Tome 76 (1972), pp. 300-305. http://geodesic.mathdoc.fr/item/MOMA_1972__76_177607/