À propos de cet article
Publié en ligne: 14 juil. 2009
Pages: 187 - 192
DOI: https://doi.org/10.2478/v10037-009-0022-x
This content is open access.
Bo Li
Qingdao University of Science and Technology, China
Yanhong Men
Qingdao University of Science and Technology, China