%0 Journal Article %A L. V. Zilbergleǐt %T Topological invariants of geometric singularities of solutions of Monge--Amp\'ere equations %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1988 %P 30-37 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1988_9_a4/ %G ru %F IVM_1988_9_a4