%0 Journal Article %A Pan, Qingfei %A Wang, Kun %T On the Bound of the C* Exponential Length %J Canadian mathematical bulletin %D 2014 %P 853-869 %V 57 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2014-044-8/ %R 10.4153/CMB-2014-044-8 %F 10_4153_CMB_2014_044_8