1. Andrushchenko, P.F., Mineral Composition and Textures of Ferromanganese Nodules, in Zhelezomargantsevye konkretsii Tikhogo okeana (Ferromanganese Nodules in the Pacific Ocean), Bezrukov, P.L., Ed., Moscow: Nauka, 1976, pp. 123–167.
2. Anikeeva, L.I., Kazakova, V.E., and Torokhov, M.P., Mineral Composition, in Kobaltbogatye rudy Mirovogo okeana (Cobalt-Rich Ores in the World Ocean), St. Petersburg: Vseross. Nauchno-Issled. Inst. Okeangeologiya, 2002, pp. 41–54.
3. Aplin, A.C., Rare Earth Element Geochemistry of Central Pacific Ferromanganese Encrustations, Earth Planet. Sci. Lett., 1984, vol. 71, no. 1, pp. 13–22.
4. Balashov, Yu.A., Geokhimiya redkozemel’nykh elementov (Geochemistry of Rare Earth Elements), Moscow: Nauka, 1976.
5. Baturin, G.N., Fosfority na dne okeanov (Phosphorites on Ocean Floor), Moscow: Nauka, 1978.