1. 1The Polytechnic, Bucharest, Rumania.
2. 2The University of Trondheim, Norway
3. 3Georgetown University, W ashington D.C., USA.
4. 4The University of Trondheim, Norway.
5. 5University of Kragujevac, Yugoslavia.
6. 6Hebei Chemical Engineering Institute, Shijiazhuang, PR China.
7. 7Hebei Academy of Sciences, Shijiazhuang, PR China.
8. 8Computer Centre, The University of Düsseldorf, FR Germany.
9. 9University of Novi Sad, Yugoslavia.
10. 10The Rugjer Bošković Institute, Zagreb, Yugoslavia.