Phases and phase transitions in two dimensional superconducting films
  This paper has been withdrawn by the author 
Weiwei Zhao, Qingyan Wang, Minhao Liu, Wenhao Zhang, Yilin Wang, Mu   Chen, Yang Guo, Ke He, Xi Chen, Yayu Wang, Jian Wang, ...
cond-mat.supr-con cond-mat.mes-hall