Conservation and regulation of water resources qualityVelner, Harald-AdamSelected problems of modern scientific and practical hydrology. Part 1, Water resources, hydrological calculations and forecast1981 / p. 89-101 : ill https://www.ester.ee/record=b4269370*est

Selected problems of modern scientific and practical hydrology1981 https://www.ester.ee/record=b4269370*est