@article{BUMI_1935_1_14_5_a2,
     author = {Barzaghi, Angelo},
     title = {Su alcune identit\`a trigonometriche},
     journal = {Bollettino della Unione matematica italiana},
     pages = {282--286},
     publisher = {mathdoc},
     volume = {Ser. 1, 14},
     number = {5},
     year = {1935},
     zbl = {61.0990.04},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1935_1_14_5_a2/}
}