Synthesis and Crystal Structures of (C4H12N2)[Mn(HSeO3)2Cl2] and [(C4N12N2)2Br]2[Mn(HSeO3)2Br2]—New Representatives of the Modular Family of "Layered Hydroselenites" - Kireev, V. E.; Dmitriev, D. N.; Charkin, D. O.; Aksenov, S. M. (Crystallography Reports, 2025)