%0 Journal Article
%T Second-order PDEs in four dimensions with half-flat conformal structure
%A B. Kruglikov
%A E. V. Ferapontov
%A S. Berjawi
%A V. Novikov
%J -
%D 2020
%R 10.1098/rspa.2019.0642
%X We study second-order partial differential equations (PDEs) in four dimensions for which the conformal structure defined by the characteristic variety of the equation is half-flat (self-dual or ant..
%U https://royalsocietypublishing.org/doi/10.1098/rspa.2019.0642