@article{MZ_1962__80_170115,
     author = {R.P. Boas jr.},
     title = {On sine series with positive coefficients.},
     journal = {Mathematische Zeitschrift},
     pages = {382--383},
     publisher = {mathdoc},
     volume = {80},
     year = {1962},
     zbl = {0107.05201},
     url = {http://geodesic.mathdoc.fr/item/MZ_1962__80_170115/}
}