%0 Journal Article %A V. A. Naishul' %T Topological invariants for germs of analytic and area-preserving mappings, and their application to analytic differential equations in $\mathbb{CP}^2$ %J Funkcionalʹnyj analiz i ego priloženiâ %D 1980 %P 73-74 %V 14 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1980_14_1_a19/ %G ru %F FAA_1980_14_1_a19