@article{JRAM_1927__158_149630,
     author = {G. P\'olya},
     title = {\"Uber trigonometrische {Integrale} mit nur reellen {Nullstellen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {6--18},
     publisher = {mathdoc},
     volume = {158},
     year = {1927},
     zbl = {53.0308.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1927__158_149630/}
}