1. Aeronautical Research Institute of Sweden, Stockholm Sweden, March 1980.
2. Swedish Royal Institute, Stockholm Sweden, April 1980
3. Lund University, Lund Sweden, March 1980.
4. University of Minnesota Controls Sciences Seminar, Minneapolis Minnesota, October 1981.
5. Wichita State University, Wichita Kansas, June 1982.
6. Lund University, Lund Sweden, August 1983.
7. Aeronautical Research Institute of Sweden, Stockholm Sweden, August 1983.
8. University of Minnesota Controls Sciences Seminar, Minneapolis Minnesota, March 1986.
9. USAF Phillips Lab, Space & Missiles Directorate, Structures and Control Division Seminar, Albuquerque, New Mexico, July 1996.