1980, YU Seminar on Graph theory, Beograd, Yugoslavia.
1981, Combinatorial conference, Eger, Hungary.
1983, YU Seminar on Graph theory, Novi Sad, Yugoslavia.
1984, Leoben-Ljubljana seminar on Graph theory, Leoben, Austria.
1985, Leoben-Ljubljana seminar on Graph theory, Leoben, Austria.
1985, YU Seminar on Graph theory, Dubrovnik, Yugoslavia.
1986, YU Seminar on Graph theory, Zagreb, Yugoslavia.
1987, 11th British Combinatorial Conference, London, UK.
1988, MATH/CHEM/COMP 88, Dubrovnik, Yugoslavia.
1988, COMBINATORICS 88, Ravello, Italy.
1989, 2nd Catania Combinatorial Conference, Santa Tecla, Italy.
1990, 1st Malta Conference on Graphs and Combinatorics, Malta.
1990, MATH/CHEM/COMP 90, Dubrovnik, Yugoslavia.
1991, Graphs and Hypergraphs, Varenna, Italy.
1991, Algebraic and Topological Methods in Graph Theory, Bled, Slovenia.
1992, 11th Leoben-Ljubljana seminar on Graph theory, Leoben, Austria.
1992, 3rd Catania Combinatorial Conference, Santa Tecla, Italy. Combinatorics'92, Santa Tecla (Acireale) 6-13. september 1992;
1993, 3rd European Conference on Social Network Analysis, M\”{u}nchen, Germany. 10-13. June 1993. DJI, M\”{u}nchen
1993, MATH/CHEM/COMP 93, Rovinj, Croatia.
1994, MATH/CHEM/COMP'94, Dubrovnik, Croatia (invited lecture).
1995, Bled, Slovenia.