1. 1. V. M. Bondarenko, "On (min, max)-equivalence of posets and applications to the Tits forms," Visn. Kyiv Univ., Ser. Fiz. Mat., No. 1, 24-25 (2005).
2. 2. V. V. Bondarenko, V. M. Bondarenko, M. V. Stepochkina, I. V. Chervyakov, "1-over-supercritical partially ordered sets with trivial group of automorphisms and min-equivalence. I," Nauk. Visn. Uzhgorod. Univ., Ser. Mat. Inf., 22, No. 2, 17-25 (2011) (in Russian).
3. 3. V. M. Bondarenko, A. M. Polishchuk, "On a criterion of positive definiteness for one class of infinite quadratic forms," Nelin. Kolyv., 6, No. 1, 3-14 (2003);
4. English translation: Nonlinear Oscil., 6, No. 1, 1-12 (2003), https://doi.org/10.1023/A:1024886517654
5. 4. V. M. Bondarenko, A. M. Polishchuk, "On finiteness of critical Tits forms of posets," Proc. Inst. Math. NAS Ukraine, 50, Part 3, 1061-1063 (2004).