%0 Journal Article
%A Apala Majumdar
%A J.M. Robbins
%A Maxim Zyskin
%T Tangent unit-vector fields: Nonabelian homotopy invariants and the Dirichlet energy
%J Comptes Rendus. Mathématique
%D 2009
%P 1159-1164
%V 347
%N 19-20
%I Elsevier
%R 10.1016/j.crma.2009.09.002
%G en
%F CRMATH_2009__347_19-20_1159_0