6th International Conference on Solid State Ionics, Garmisch-Partenkirchen, Sept. 1987
11th International Conference on Solid State Ionics, Honolulu, Hawaii 16. - 21. Nov. 1997
3rd Intl. Meeting on Solid Electrolytes - Solid State Ionics and Galvanic Cells, Tokyo, 15 - 19 Sept. 1980