Geodesic
Analogue of A.\,A.~Markov's inequality for polynomials in two variables
Sbornik. Mathematics, Tome 199 (2008) no. 9, pp. 1409-1420

Voir la notice de l'article provenant de la source Math-Net.Ru

A sharp estimate is obtained for a partial derivative of any order of polynomials in two variables at points outside the unit ball in $l_2^2$ for polynomials normed on the Chebyshev grid of points of the unit ball in $l_1^2$. Bibliography: 8 titles. 
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     author = {V. I. Skalyga},
     title = {Analogue of {A.\,A.~Markov's} inequality for polynomials in two variables},
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V. I. Skalyga. Analogue of A.\,A.~Markov's inequality for polynomials in two variables. Sbornik. Mathematics, Tome 199 (2008) no. 9, pp. 1409-1420. http://geodesic.mathdoc.fr/item/SM_2008_199_9_a3/