1. 1. V. V. Bondarenko, V. M. Bondarenko, M. V. Styopochkina, 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).
2. 2. V. M. Bondarenko, M. V. Styopochkina, "(Min, max)-equivalence of posets and quadratic Tits form," in: Problems of Analysis and Algebra [in Russian], 2, No. 3, Inst. Mat. NAN Ukr., Kyiv (2005), pp. 18-58.
3. 3. V. M. Bondarenko, M. V. Stepochkina, "(Min, max)-equivalence of posets and non-negative Tits forms," Ukr. Mat. Zh., 60, No. 9, 1157-1167 (2008) (in Russian)
4. English translation: Ukr. Math. J., 60, No. 9., 1349-1359 (2008), https://doi.org/10.1007/s11253-009-0147-7
5. 4. V. M. Bondarenko, M. V. Stepochkina, "Description of posets critical with respect to the nonnegativity of the quadratic Tits form," Ukr. Mat. Zh., 61, No. 5, 611-624 (2009) (in Russian)