@article{BUMI_1957_3_12_1_a7,
     author = {Pistoia, Angelo},
     title = {Sulla serie $\sum^\infty_{k=1} \alpha_k \vert  \sin(\lambda_kx) \vert \sp {v_k}$.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {41--45},
     publisher = {mathdoc},
     volume = {Ser. 3, 12},
     number = {1},
     year = {1957},
     zbl = {0077.28003},
     mrnumber = {87801},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1957_3_12_1_a7/}
}