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V. M. Bondarenko

Positive definiteness criteria for a certain class of infinite quadratic forms: V. M. Bondarenko and A. M. Polishchuk; Volume 6, No.1, pp. 3-14; Link PDF
On positive definite Tits forms for unbounded partially ordered sets with involution: V. M. Bondarenko and D. S. Chebotarev; Volume 8, No.1, pp. 9-17; Link PDF
A classification of linear operators with minimal polinomial $f(t) = (t-a)(t-b)$ , $a \neq b$ , acting in a filtered vector space: V. M. Bondarenko; Volume 3, No.1, pp. 31-35; Link
On series partially ordered sets with positive definite Tits form: V. M. Bondarenko and M. V. Stepochkina; Volume 9, No.3, pp. 320-325; Link PDF