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@article{PORMA_1949__8_2_114673, author = {Erd\"os, P.}, title = {On the coefficients of the cyclotomic polynomial}, journal = {Portugaliae mathematica}, pages = {63--71}, publisher = {mathdoc}, volume = {8}, number = {2}, year = {1949}, mrnumber = {0035787}, zbl = {0038.01004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1949__8_2_114673/} }
Erdös, P. On the coefficients of the cyclotomic polynomial. Portugaliae mathematica, Tome 8 (1949) no. 2, pp. 63-71. http://geodesic.mathdoc.fr/item/PORMA_1949__8_2_114673/