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Discrete Dynamics in Nature and Society
Volume 3, Issue 4, Pages 241-242
http://dx.doi.org/10.1155/S1026022699000266

Introduction

Copyright © 1999 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.

Abstract

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