Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1966__165_161420, author = {G. HELMBERG}, title = {\"Uber konservative {Transformationen.}}, journal = {Mathematische Annalen}, pages = {44--61}, publisher = {mathdoc}, volume = {165}, year = {1966}, url = {http://geodesic.mathdoc.fr/item/MAN_1966__165_161420/} }
G. HELMBERG. Über konservative Transformationen.. Mathematische Annalen, Tome 165 (1966), pp. 44-61. http://geodesic.mathdoc.fr/item/MAN_1966__165_161420/