@article{MAN_1923__89_159004,
     author = {J.G. Corput van der},
     title = {Neue zahlentheoretische {Absch\"atzungen}},
     journal = {Mathematische Annalen},
     pages = {215--254},
     publisher = {mathdoc},
     volume = {89},
     year = {1923},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__89_159004/}
}