Physical aspects of self-purification in water-bodiesPaal, LeopoldReports of the IV All-Union Symposium on Actual Problems of Self-Purification of Water-Bodies and the Regulation of Water Quality : Tallinn, 16th-18th April 19791980 / p. 4-10 https://www.ester.ee/record=b1281846*est

Some problems of water quality regulation of water-bodies and the Baltic SeaVelner, Harald-AdamReports of the IV All-Union Symposium on Actual Problems of Self-Purification of Water-Bodies and the Regulation of Water Quality : Tallinn, 16th-18th April 19791980 / p. 51-60 https://www.ester.ee/record=b1281846*est

The present state and long-rate development of sanitary hygienic aspects of water qualitySaava, AstridReports of the IV All-Union Symposium on Actual Problems of Self-Purification of Water-Bodies and the Regulation of Water Quality : Tallinn, 16th-18th April 19791980 / p. 28-38 https://www.ester.ee/record=b1281846*est