@article{MZ_1923__16_174954,
     author = {M. Mathias},
     title = {\"Uber positive {Fourier-Integrale}},
     journal = {Mathematische Zeitschrift},
     pages = {103--125},
     year = {1923},
     volume = {16},
     zbl = {49.0207.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1923__16_174954/}
}