Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1929__1_138520, author = {Alexander Ostrowski}, title = {Zur {Theorie} der konvexen {Funktionen.}}, journal = {Commentarii mathematici Helvetici}, pages = {157--159}, publisher = {mathdoc}, volume = {1}, year = {1929}, zbl = {55.0143.02}, url = {http://geodesic.mathdoc.fr/item/CMH_1929__1_138520/} }
Alexander Ostrowski. Zur Theorie der konvexen Funktionen.. Commentarii mathematici Helvetici, Tome 1 (1929), pp. 157-159. http://geodesic.mathdoc.fr/item/CMH_1929__1_138520/