1. O. A. Alekin, Fundamentals of Hydrochemistry (Gidrometeoizdat, Leningrad, 1953) [in Russian].
2. B. Kh. Glukhovskii, Hydrometeorology and Hydrochemistry of the USSR Seas, Vol. 2: The White Sea (Gidrometeoizdat, Leningrad, 1991) [in Russian].
3. GOST 17.1.3.07-82. Nature Protection (Protected Areas). Hydrosphere. Rules for Controlling Water Quality in Water Bodies and Watercourses (1982) [in Russian].
4. GOST 17.1.5.01-80.
Nature Protection. Hydrosphere. General Requirements for Bottom Sediment Sampling in Water Bodies for Contamination Analysis (Izd-vo Standartov, 2002) [in Russian].
5. E. N. Imant, M. I. Zmetnaya, and A. P. Novoselov, "Assessment of Water Quality in the Lower Reaches of the Northern Dvina River Based on the Analysis of Indicator Zooplankton Species," Problemy Regional’noi Ekologii, No. 1 (2020) [in Russian].