1. O. A. Alekin and Yu. I. Lyakhin, Chemistry of the Ocean (Gidrometeoizdat, Leningrad, 1984) [in Russian].
2. Archive Ifremer, Institut Français de Recherche pour l’Exploitation de la Mer. ftp://ftp.ifremer.fr. Cited February 3, 2020.
3. Bank of oceanographic data of the Marine Hydrophysical Institute. http://bod-mhi.ru.
4. V. N. Eremeev, L. I. Ivanov, S. K. Konovalov, et al., “The role of oxygen, sulfide, nitrate and ammonium fluxes in the development of the hydrochemical structure of the main pycnocline and anaerobic zone of the Black Sea,” Morsk. Gidrofiz. Zh., No. 1, 64–82 (2001).
5. N. N. Zubov, Sea Waters and Ices (Gidrometeoizdat, Moscow, 1938) [in Russian].