Boundary Value Problems 2009, 2009:541435 doi:10.1155/2009/541435
The electronic version of this article is the complete one and can be found online at: http://www.boundaryvalueproblems.com/content/2009/1/541435
| Received: | 16 March 2009 |
| Accepted: | 28 May 2009 |
| Published: | 29 June 2009 |
© 2009 The Author(s).
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