V. M. Gichev, I. A. Zubareva, E. A. Mescheryakov, “Semigroups of polygons whose vertices define a centered partition of $\mathbb R^n$”, Mat. Tr., 15:1 (2012), 55–73; Siberian Adv. Math., 23:1 (2013), 20–31
2007
2.
V. M. Gichev, E. A. Meshcheryakov, “On geometry of flat complete strictly causal Lorentzian manifolds”, Sibirsk. Mat. Zh., 48:1 (2007), 75–88; Siberian Math. J., 48:1 (2007), 62–72