O. Marchuk, O. Smitiukh, Y. Prots, and A. Fedorchuk, “Crystal structure of chalcogenides R’xR’’yR’’’zPbSi2S8 (R’ – La, R’’ – Tb, R’’’ – Er)”, Phys.Chem.Sol.State, vol. 22, no. 4, pp. 621–629, Nov. 2021.