DOUBLE YTTRIUM THIOSILICATES AYSiS4 (A = Rb, Cs): SYNTHESIS, STRUCTURE, OPTICAL PROPERTIES. - Tarasenko, M. S.; Duritsyn, R. V.; Potapov, D. A.; Kuratieva, N. V.; Ryadun, A. A.; Naumov, N. G. (Journal of Structural Chemistry, 2022)