%0 Journal Article
%A Majumdar, Apala
%A Robbins, J.M.
%A Zyskin, Maxim
%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
%U http://www.numdam.org/articles/10.1016/j.crma.2009.09.002/
%R 10.1016/j.crma.2009.09.002
%G en
%F CRMATH_2009__347_19-20_1159_0