Research Article
Department of Mathematics, Northwest Normal University, Lanzhou 730070, China
Boundary Value Problems 2010, 2010:626054 doi:10.1155/2010/626054
The electronic version of this article is the complete one and can be found online at: http://www.boundaryvalueproblems.com/content/2010/1/626054
| Received: | 31 August 2010 |
| Revisions received: | 30 October 2010 |
| Accepted: | 8 November 2010 |
| Published: | 25 November 2010 |
© 2010 Ruyun Ma et al.
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.
This paper is devoted to study the existence of periodic solutions of the second-order
equation 
, where 
is a Carathéodory function, by combining a new expression of Green's function together
with Dancer's global bifurcation theorem. Our main results are sharp and improve the
main results by Torres (2003).
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