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@article{MS2_1957__5_165663, author = {AUREL WINTNER}, title = {The theorem of {Enestr\"om} and the extremal functions of {Landau-Schur}}, journal = {Mathematica Scandinavica}, pages = {236--240}, publisher = {mathdoc}, volume = {5}, year = {1957}, zbl = {0081.07103}, url = {http://geodesic.mathdoc.fr/item/MS2_1957__5_165663/} }
AUREL WINTNER. The theorem of Eneström and the extremal functions of Landau-Schur. Mathematica Scandinavica, Tome 5 (1957), pp. 236-240. http://geodesic.mathdoc.fr/item/MS2_1957__5_165663/