%0 Journal Article
%A Sara Froehlich
%T The Variational Bi-Complex for Systems of Semi-Linear Hyperbolic PDEs in Three Variables
%J Symmetry, integrability and geometry: methods and applications
%D 2018
%V 14
%U http://geodesic.mathdoc.fr/item/SIGMA_2018_14_a95/
%G en
%F SIGMA_2018_14_a95