%0 Journal Article %A Yu, Bin %T A note on homotopy classes of nonsingular vector fields on $ {S}^{3}$ %J Comptes Rendus. Mathématique %D 2014 %P 351-355 %V 352 %N 4 %I Elsevier %U http://www.numdam.org/articles/10.1016/j.crma.2014.01.016/ %R 10.1016/j.crma.2014.01.016 %G en %F CRMATH_2014__352_4_351_0