1. Dem’yanets, L.N., Lobachev, A.N., and Emel’chenko, G.A., Germanaty redkozemel’nykh elementov (Rare-Earth Germanates), Moscow: Nauka, 1980.
2. Bondar’, I.A., Vinogradova, V.N., Dem’yanets, L.N., et al., Soedineniya redkozemel’nykh elementov. Silikaty, germanaty, fosfaty, arsenaty, vanadaty (Rare-Earth Compounds: Silicates, Germanates, Phosphates, Arsenates, and Vanadates), Moscow: Nauka, 1983.
3. Portnoi, K.I. and Timofeeva, N.I., Kislorodnye soedineniya redkozemel’nykh elementov (Rare-Earth Oxide Compounds), Moscow: Metallurgiya, 1986.
4. Kozlov, V.D., Magunov, R.L., Kovalevskaya, I.P., et al., Preparation of neodymium, samarium, and europium germanates, Ukr. Khim. Zh (Russ. Ed.), 1973, vol. 39, pp. 658–662.
5. Ding, L., Zhang, Q., Liu, W., et al., Preparation and luminescence properties of Yb3+ activated Gd2GeO5, J. Alloys Compd., 2013, vol. 557, pp. 261–264.