Trukhchev, D., Georgiev, V., Krastev, A. and Mavrodieva, R. 2026. Features of the Intra-annual Variability of the Hydrochemical and Hydrobiological State of Varna Lakes in the Period 2022–2023. Proceedings of the Bulgarian Academy of Sciences. 79, 5 (May 2026), 603–614. DOI:https://doi.org/10.7546/CRABS.2026.05.08.