Geodesic
On Extremal Properties of the Derivatives of Polynomials and Rational Functions
Canadian mathematical bulletin, Tome 7 (1964) no. 1, pp. 121-131

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Let p(z) be a polynomial of degree n, i. e. a finite sum of the form where cν are any given numbers and z=x+iy is a complex variable. To answer a question raised by the chemist Mendelieff, A. Markoff [3] proved the following theorem. 
Malik, M.A. On Extremal Properties of the Derivatives of Polynomials and Rational Functions. Canadian mathematical bulletin, Tome 7 (1964) no. 1, pp. 121-131. doi: 10.4153/CMB-1964-014-4
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     title = {On {Extremal} {Properties} of the {Derivatives} of {Polynomials} and {Rational} {Functions}},
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     doi = {10.4153/CMB-1964-014-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-014-4/}
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