El’vira А. Rumyantseva, & Nelly N. Bobrovitskaya. (2021). FORMATION OF VARIABILITY OF FLOW QUALITY IN THE TOP OF THE LUGA RIVER IN INTER-ANNUAL AND SHORT-TERM TIME. PART 1. INTERANNUAL VARIABILITY. Hydrosphere. Hazard Processes and Phenomena, 3(1), 39-58. https://doi.org/10.34753/HS.2021.3.1.39