@article{MZ_1918__1_167456,
     author = {0., Sz\'asz},
     title = {Ungleichungen f\"ur die {Koeffizienten} einer {Potenzreihe}},
     journal = {Mathematische Zeitschrift},
     pages = {163--183},
     publisher = {mathdoc},
     volume = {1},
     year = {1918},
     zbl = {46.0479.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1918__1_167456/}
}