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Publicado en línea: 08 jul 2010
Páginas: 245 - 248
DOI: https://doi.org/10.2478/v10037-009-0031-9
This content is open access.
Bo Li
Qingdao University of Science and Technology, China
Dailu Li
Qingdao University of Science and Technology, China
Yanhong Men
Qingdao University of Science and Technology, China
Xiquan Liang
Qingdao University of Science and Technology, China