Participation in International Congresses and Symposia:

• III European Symp. on Earthquake Engineering, Bulgaria (1996);
• IAEG Symp. on Landslides and other Mass Movements, Czechoslovakia (1977);
• IAEG Int. Symp. on Eng. Geology Problems in Seismic Areas, Italy (1986);
• Carpatho-Balkan Geological Association Congresses: Bulgaria (1965), Poland
• (1985), Greece (1995);
• CBGA- Commission of Hydrogeology and Engineering Geology Working Meetings
• in: Bulgaria, Romania, Poland, Hungary, Slovakia;
  

Reports sent to:

• Int. Ass. of Eng. Geology Congresses in Spain (1978), India (1982),
• Argentina (1986), the Netherlands (1990);
• Int. Symposia on the Landslides and Slope Stability in Italy (1971), Suisse
• (1988);
• Int. Symp. on the Eng. Geology on Ancient Works, Monuments and Historical
• Sites, Greece (1988);
• Int.Congress on Deterioration and Conservation of Stone, Lisboa, Portugal
• (1992), etc.