colloquy organized jointly by the Council of Europe and the Directorate of Monuments and Landscapes of the Ministry of the Flemish Community, Antwerp (Belgium) 3-6 November 1992
colloquy organised by the Council of Europe with the Austrian Ministry of Science and Research and the Bundesdenkmalamt, Vienna (Austria), 11-13 December 1989
Conferenza sulla conservazione delle zone umide di importanza internazionale specialmente come habitat degli uccelli acquatici (1980 : Cagliari, Italy)