Yongxiang Su; moc.361@repusxys Received 20 January 2018; Revised 17 May 2018; Accepted 22 July 2018; Published 31 July 2018 Academic Editor: Sergio Teggi Copyright © 2018 Fengkui Cui and Yongxiang Su
Editor: Antonino Squillace Copyright © 2018 Fengkui Cui et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and
; Published 11 February 2018 Academic Editor: Yannis Dimakopoulos Copyright © 2018 Fengkui Cui et al. This is an open access article distributed under the Creative Commons Attribution License, which permits