Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1935__39_168562, author = {H. Boerner}, title = {Zur {Theorie} der zweiten {Variation}}, journal = {Mathematische Zeitschrift}, pages = {492--500}, publisher = {mathdoc}, volume = {39}, year = {1935}, zbl = {61.0549.02}, url = {http://geodesic.mathdoc.fr/item/MZ_1935__39_168562/} }
H. Boerner. Zur Theorie der zweiten Variation. Mathematische Zeitschrift, Tome 39 (1935), pp. 492-500. http://geodesic.mathdoc.fr/item/MZ_1935__39_168562/