Geodesic
A Representation of a Nonnegative Algebraic Polynomial of Degree Four as a Sum of Two Squares of Real Polynomials
Mathematica balkanica, Tome 14 (2000) no. 3-4, p. 305.

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     author = {P. G. Todorov},
     title = {A {Representation} of a {Nonnegative} {Algebraic} {Polynomial} of {Degree} {Four} as a {Sum} of {Two} {Squares} of {Real} {Polynomials}},
     journal = {Mathematica balkanica},
     pages = {305},
     publisher = {mathdoc},
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     number = {3-4},
     year = {2000},
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P. G. Todorov. A Representation of a Nonnegative Algebraic Polynomial of Degree Four as a Sum of Two Squares of Real Polynomials. Mathematica balkanica, Tome 14 (2000) no. 3-4, p. 305. http://geodesic.mathdoc.fr/item/MABA_2000_14_3-4_a11/