Geodesic
On Zeros of Derivatives of Polynomials
Canadian mathematical bulletin, Tome 11 (1968) no. 3, pp. 443-445

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In an earlier paper [2], we raised the question of determining the minimum span of the kth derivative of a polynomial with real zeros having a given span. More precisely let πn, s denote the class of polynomials , with x1 ≤ x2 ≤ ... ≤ xn, and the span σ(P) ≡xn - x1 = 2s (fixed). 
Meir, A.; Sharma, A. On Zeros of Derivatives of Polynomials. Canadian mathematical bulletin, Tome 11 (1968) no. 3, pp. 443-445. doi: 10.4153/CMB-1968-051-x
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     author = {Meir, A. and Sharma, A.},
     title = {On {Zeros} of {Derivatives} of {Polynomials}},
     journal = {Canadian mathematical bulletin},
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     year = {1968},
     volume = {11},
     number = {3},
     doi = {10.4153/CMB-1968-051-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-051-x/}
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