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A continual analogue of a theorem by M. Fekete and G. PólyaKATKOVA, Olga M; VISHNYAKOVA, Anna M.Positivity (Dordrecht). 2001, Vol 5, Num 1, pp 1-11, issn 1385-1292Article

Linear Operators Preserving the Set of Positive (Nonnegative) PolynomialsKATKOVA, Olga M; VISHNYAKOVA, Anna M.Lecture notes in control and information sciences. 2009, Vol 389, pp 83-90, issn 0170-8643, isbn 978-3-642-02894-6 3-642-02894-2, 8 p.Conference Paper