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Bradley Delso, Margarita (1989) A sufficient condition for a polynomial to be sum of 2mth powers of rational functions. Comptes Rendus Mathématiques de l'Académie des Sciences. Mathematical Reports of the Academy of Science , 11 (2). pp. 63-68. ISSN 0706-1994
Bradley Delso, Margarita (1990) An elementary based sufficient condition for sums of 2mth powers of polynomials over non-archimedean real closed fields. Journal of Pure and Applied Algebra , 63 (3). pp. 219-224. ISSN 0022-4049
Bradley Delso, Margarita (1989) Convex-Hull Of Polynomials And Sums Of 2m-Th Powers. Comptes Rendus de l'Académie des Sciences. Série I. Mathématique , 309 (12). pp. 751-755. ISSN 0764-4442
Bradley Delso, Margarita and Prestel, Alexander (1989) Representation of a real polynomial f(X) as a sum of 2mth powers of rational functions. In Ordered algebraic structures : Proceeding of the Caribean mathematics Foundations Conference. Mathematics and its Applications (55). Kluwer Acad. Publ, Dordrecht, pp. 197-207. ISBN 0-7923-0489-6