Colloque Syste mes diffe rentiels et singulatie s (1983 Marseille-Luminy)
Leopoldina-Symposium (1978 Schloss Reinhardsbrunn, Germany)
Japan) Conference on Theory of Singularities (1980 Katata
Stephen Shing-Toung Yau
Eiichi Bannai
J. Briançon
Erik Seedhouse
F. Reese Harvey
Peter Orlik
Thomas Schulze-Röbbecke
Frederic Pham
H. Brézis
Shihoko Ishii
John J. H. Miller
Luc Florack
U. Orbanz
Frédéric Pham
Harold Levine
Friedrich Hirzebruch
Dũng Tráng Lê