Yao, B. C.
Rao, Y. J.
Wang, Z. N.
Wu, Y.
Zhou, J. H.
Wu, H.
Fan, M. Q.
Cao, X. L.
Zhang, W. L.
Chen, Y. F.
Li, Y. R.
Churkin, D.
Turitsyn, S.
Wong, C. W.
Article History
Received: 2 September 2015
Accepted: 17 November 2015
First Online: 21 December 2015
Competing interests
: The authors declare no competing financial interests.