Geodesic
On the Location of Zeros of Polynomials
Canadian mathematical bulletin, Tome 10 (1967) no. 1, pp. 53-63

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The different results proved in this paper do not have very much in common. Since they all deal with the location of the zeros of a polynomial, we have decided to put them in one place. Improving upon a classical result of Cauchy we obtain in § 2 a circle containing all the zeros of a polynomial. In § 3 we obtain an extension of the well known theorem of Enestrőm and Kakeya concerning the zeros of a polynomial whose coefficients are non-negative and monotonie. 
Joyal, A.; Labelle, G.; Rahman, Q.I. On the Location of Zeros of Polynomials. Canadian mathematical bulletin, Tome 10 (1967) no. 1, pp. 53-63. doi: 10.4153/CMB-1967-006-3
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     author = {Joyal, A. and Labelle, G. and Rahman, Q.I.},
     title = {On the {Location} of {Zeros} of {Polynomials}},
     journal = {Canadian mathematical bulletin},
     pages = {53--63},
     year = {1967},
     volume = {10},
     number = {1},
     doi = {10.4153/CMB-1967-006-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-006-3/}
}
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