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Prokof'ev, M. V.; Pokrovskii, A. N.; Kovba, L. M. X-ray diffraction study of rubidium lanthanide sulfates (Rb3Ln(SO4)3). Vestnik Moskovskogo Universiteta, Seriya 2: Khimiya, 1979. 20 (6): 571-574. ISSN0579-9384
Samartsev, B. G.; Pokrovskii, A. N.; Kovba, L. M. X-ray diffraction study of double sulfates, isostructural with cesium neodymium sulfate (Cs3Nd(SO4)3) (in Russian). Vestnik Moskovskogo Universiteta, Seriya 2: Khimiya, 1980. 21 (2): 190-192. ISSN0579-9384