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@article{MZ_1933__37_168440, author = {J. Ridder}, title = {Der {Perronsche} {Integralbegriff.}}, journal = {Mathematische Zeitschrift}, pages = {161--169}, publisher = {mathdoc}, volume = {37}, year = {1933}, zbl = {59.0274.04}, url = {http://geodesic.mathdoc.fr/item/MZ_1933__37_168440/} }
J. Ridder. Der Perronsche Integralbegriff.. Mathematische Zeitschrift, Tome 37 (1933), pp. 161-169. http://geodesic.mathdoc.fr/item/MZ_1933__37_168440/