À propos de cet article
Publié en ligne: 09 juin 2008
Pages: 151 - 157
DOI: https://doi.org/10.2478/v10037-007-0017-4
This content is open access.
Xiquan Liang
Qingdao University of Science and Technology, China
Tao Sun
Qingdao University of Science and Technology, China
Dahai Hu
Qingdao University of Science and Technology, China