Geodesic
Necessary and sufficient conditions for the representability of a positive homogeneous function of three variables in the form of a difference of convex functions
Izvestiya. Mathematics , Tome 41 (1993) no. 2, pp. 377-387.

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Necessary and sufficient conditions are given for a positive homogeneous function of three variables to be representable as a difference of convex functions. 
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I. M. Prudnikov. Necessary and sufficient conditions for the representability of a positive homogeneous function of three variables in the form of a  difference of convex functions. Izvestiya. Mathematics , Tome 41 (1993) no. 2, pp. 377-387. http://geodesic.mathdoc.fr/item/IM2_1993_41_2_a10/

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