Abstract
We investigate the concepts of quasi-
Open Access
C
Received24 Jan 2006
Revised30 Mar 2006
Accepted04 Apr 2006
Published31 Jul 2006
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Copyright
Copyright © 2006 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.