Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1930__32_168230, author = {L, Schoenberg}, title = {\"Uber variationsvermindernde lineare {Transformationen}}, journal = {Mathematische Zeitschrift}, pages = {321--328}, publisher = {mathdoc}, volume = {32}, year = {1930}, zbl = {56.0106.06}, url = {http://geodesic.mathdoc.fr/item/MZ_1930__32_168230/} }
L, Schoenberg. Über variationsvermindernde lineare Transformationen. Mathematische Zeitschrift, Tome 32 (1930), pp. 321-328. http://geodesic.mathdoc.fr/item/MZ_1930__32_168230/