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Discrete Dynamics in Nature and Society
Volume 2009, Article ID 646258, 11 pages
Research Article

On Some Properties of Focal Points

Applied Mathematics Laboratory, University of Annaba, 23000 Annaba, Algeria

Received 13 October 2008; Revised 3 March 2009; Accepted 18 June 2009

Academic Editor: B. Sagar

Copyright © 2009 M. R. Ferchichi and I. Djellit. 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.

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