Geodesic
Conditions for positiveness of integral quadratic forms
Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz, Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz, Tome 1 (1977) no. 1, pp. 33-36 
A. L. Kuz'mina. Conditions for positiveness of integral quadratic forms. Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz, Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz, Tome 1 (1977) no. 1, pp. 33-36. http://geodesic.mathdoc.fr/item/KUKTF_1977_1_1_a4/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

[1] Sirazetdinov T. K., “Metod funktsii Lyapunova v zadachakh upravleniya sistemami s raspredelennymi parametrami (obzor)”, Avtomatika i telemekhanika, 1972, no. 7, 5–21 | MR

[2] Trikomi F., Integralnye uravneniya, IL, M., 1960