%0 Journal Article
%T A characterisation of virtually free groups
%A Robert H. Gilman
%A S. Hermiller
%A Derek F. Holt
%A Sarah Rees
%J Mathematics
%D 2011
%I arXiv
%X We prove that a finitely generated group $G$ is virtually free if and only if there exists a generating set for $G$ and $k > 0$ such that all $k$-locally geodesic words with respect to that generating set are geodesic.
%U http://arxiv.org/abs/1111.0771v1