1. Fifteenth Symposium (International) on Combustion;Wersborg,1975
2. Eleventh Symposium (International) on Combustion;Place,1967
3. On the size, charge and number-rate of formation of carbon particles in flames subjected to electric fields
4. Thirteenth Symposium (International) on Combustion;Ball,1971
5. Fourteenth Symposium (International) on Combustion;Wersborg,1973