1. https://nickelinstitute.org.
2. V.S. Biletsky (ed.), Small Mining Encyclopedia [in Ukrainian], 3 Vols., Donbas, Donetsk (2007), Vol. 2, p. 670, ISBN 57740-0828-2.
3. SMR—Steel & Metals Market Research GmbH, https://www.smr.at/home.html.
4. V.P. Grytsai, V.M. Bredikhin, I.F. Chervonyi, V.I. Pozhuev, M.O. Maniak, O.V. Rabynovych, O.I. Shevelev, and V.S. Ignatiev, Nonferrous metallurgy, Part 5, Heavy Metal Metallurgy, Book 2, Copper and Nickel Technology [in Ukrainian], I.F. Chervonyi (ed.), ZDIA, Zaporizhzhia (2010), p. 447.
5. https://www.lme.com/en/Metals/Non-ferrous/LME-Nickel#Summary.