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Participation in international congresses and conferences
- International Congress of Mathematicians, Helsinki, 1978, 45-minute
invited talk "Global and local aspects of the theory of complex
diffe-
rential equations" in the section of ordinary differential equations;
- International Congress of Mathematicians, 1990, 45-minute
invited talk "Finiteness theorems for limit cycles" in the section
of ordinary differential equations;
- Equadiff, Barcelona, 1991, Plenary lecture "Finiteness theorems
for limit cycles and Hilbert-Arnold problem;
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