REFERENCES
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- Querré , J. ( 1976 ). Cours d'algèbre . Editions MASSON .
- Ramis , E. , Deschamps , C. , Odoux , J. ( 1979 ). Mathématiques Spéciales . Tome 2, Editions MASSON.
- Reznick , B. ( 1992 ). Sums of even powers of real linear forms . Memoires of American Mathematical Society. 6 : 463 .
- Communicated by A. Prestel.