@article{10_4153_CMB_2014_044_8,
     author = {Pan, Qingfei and Wang, Kun},
     title = {On the {Bound} of the {C*} {Exponential} {Length}},
     journal = {Canadian mathematical bulletin},
     pages = {853--869},
     year = {2014},
     volume = {57},
     number = {4},
     doi = {10.4153/CMB-2014-044-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2014-044-8/}
}