1. Common research cooperation in the field of sonochemistry with Coventry University, Prof. T. J. Mason, United-Kingdom from 1994. Active.
2. Common research cooperation in the field of electron transfer organic reaction activated by ultrasound, with Paul Sabatier University, Toulouse, Dr. Max Koenig, France, from 1995. Ended.
3. Common research cooperation in the field of sonochemistry, electron transfer reactions, with Universite de Savoie, Chambery, Prof. Jean-Louis Luche, France, from 1994. Ended.
4. Common research cooperation in the field of less known phenomenon induced by ultrasounds, with Universite Blaise Pascal, Clermont-Ferrand, Dr. Claude Bernard, France, from 1996. Ended.
5. European Research Programme COPERNICUS, on ultrasonically assisted extraction from plants, 1995-1997. Ended.
6. Memorandum of cooperation with Institute of Chemistry, Bratislava, Slovak Republic, Dr. Jozef Sandula, from 1996. Active.
7. COST D10/0016/1999, Sonochemical Application to Food Additives, Flavours, Fragrances and Pharmaceuticals Extraction from Renewable Natural Resources, SAFE, co-ordinator. Activ