Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1959__72_183600, author = {Eberhard Heinz}, title = {\"Uber die {Differentialgleichung} 0 < ......rt - s{\texttwosuperior}...{\ss} < ...}, journal = {Mathematische Zeitschrift}, pages = {107--126}, publisher = {mathdoc}, volume = {72}, year = {1959}, url = {http://geodesic.mathdoc.fr/item/MZ_1959__72_183600/} }
Eberhard Heinz. Über die Differentialgleichung 0 < ......rt - s²...ß < .... Mathematische Zeitschrift, Tome 72 (1959), pp. 107-126. http://geodesic.mathdoc.fr/item/MZ_1959__72_183600/