1. Yu. A. Balashov, Geochemistry of Rare Earth Elements (Nauka, Moscow, 1976) [in Russian].
2. G. N. Baturin, Geochemistry of Ferromanganese Nodules in the Ocean (Nauka, Moscow, 1986) [in Russian].
3. G. N. Baturin and V. T. Dubinchuk, “Composition of Ferromanganese Nodules from Riga Bay (Baltic Sea),” Okeanologiya 49(1), 121–130 (2009) [Oceanology 49 (1), 111–120 (2009)].
4. G. N. Baturin, I. G. Yushina, and E. O. Zolotykh, “Variations in the Elemental Composition of Ferromanganese Structures from Lake Baikal,” Okeanologiya 49(4), 549–558 (2009) [Oceanology 49 (4), 505–514 (2009)].
5. L. A. Berkovits, V. G. Obol’yaninova, and G. N. Baturin, “Standard Samples of Ferromanganese Nodules and Sediments,” Okeanologiya 20(3), 455–463 (1980).