Protection of the environment of the Baltic Sea - our common approachVelner, Harald-AdamFocus on Estonia and the Baltic Sea : research, economy, environment : proceedings from an international seminar held in Stockholm, Tallinn and Visby, July 27-29, 19901990 / p. 77-81

Protection of the environment of the Baltic Sea - our common approachVelner, Harald-AdamEnvironmental Problems of Baltic Sea Countries : 2nd NIM Conference, June 19901990 / p. 3-6