1. Eighth Symposium (International) on Combustion;Calcote,1962
2. Ninth Symposium (International) on Combustion;Calcote,1963
3. Tenth Symposium (International) on Combustion;Calcote,1965
4. Tenth Symposium (International) on Combustion;Wortberg,1965
5. Continuum Theory of Spherical Electrostatic Probes