%0 Journal Article
%A Noah Golowich
%A David Rolnick
%T Acyclic subgraphs of planar digraphs
%J The electronic journal of combinatorics
%D 2015
%V 22
%N 3
%U http://geodesic.mathdoc.fr/articles/10.37236/4596/
%R 10.37236/4596
%F 10_37236_4596