An extremum problem for polynomials
Compositio Mathematica, Tome 14 (1959-1960), pp. 260-268. 
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     author = {Schoenberg, I. J. and Szeg\"o, Gabor},
     title = {An extremum problem for polynomials},
     journal = {Compositio Mathematica},
     pages = {260--268},
     publisher = {Kraus Reprint},
     volume = {14},
     year = {1959-1960},
     mrnumber = {130520},
     zbl = {0097.04902},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1959-1960__14__260_0/}
}
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Schoenberg, I. J.; Szegö, Gabor. An extremum problem for polynomials. Compositio Mathematica, Tome 14 (1959-1960), pp. 260-268. http://archive.numdam.org/item/CM_1959-1960__14__260_0/

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G. Szegö, [3] Orthogonal Polynomials, Revised edition, New York, 1959. | MR | Zbl