@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/}
}