1. Ahrens, L.H., Willis, J.P., and Oosthuizen, C.O., Further observations on the composition of manganese nodules with particular reference to some rarer elements, Geochim. Cosmochim. Acta, 1967, vol. 31, pp. 2169–2180.
2. Andreev, S.I., Geochemistry of ferromanganese formations in the World Ocean, Kobal’tonosnye zhelezomargantsevye korki Tikhogo okeana (Co-Bearing Ferromanganese Crusts in the Pacific Ocean), SPb.: VNIIOkeanologiya, 1993.
3. Anikeeva, L.I., Andreev, S.I., Aleksandrov, P.A., and Kazakova, V.E., Co-rich crusts in the World Ocean: Geochemistry, genesis, and distribution, Razv. Okhr. Nedr, 2005, no. 1, pp. 4754.
4. Anufriev, G.S., Blinov, L.N., Boltenkov, B.S., and Arif, M., Study of the He composition and isotopes in the Baltic ferromanganese nodules, Zh. Tekhn. Fiz., 2005, vol. 75, no. 5, pp. 133–136.
5. Astakhova N.V., Sattarova V.V. Geochemistry of ferromanganese formations in the central Sea of Okhotsk, Vulkanol. Seismol., 2005, no. 3, pp. 29–33.