@article{PIM_1981_N_S_30_44_a18,
     author = {Tatjana Ostrogorski},
     title = {Integrability {Theorems} for {Trigonometric} {Series} with {Positive} {Coefficients}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {131 },
     publisher = {mathdoc},
     volume = {_N_S_30},
     number = {44},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_30_44_a18/}
}