%0 Journal Article
%A B. S. Kruglikov
%T Some classification problems in four-dimensional geometry: distributions, almost complex structures, and generalized Monge–Ampere equations
%J Sbornik. Mathematics
%D 1998
%P 1643-1656
%V 189
%N 11
%U http://geodesic.mathdoc.fr/item/SM_1998_189_11_a2/
%G en
%F SM_1998_189_11_a2