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© United Nations Development Programme-Asia Pacific DevelopmentInformation Programme (UNDP-APDIP) - 2005Web: www.apdip.netEmail: info@apdip.netThis publication is released under the Creative Commons Attribution 2.0 license.For full details of the license, please refer to the following:Creative-commons.org/licenses/by/2.0/legalcodeELSEVIERA division ofReed Elsevier India Private Limited17A/1, Lajpat Nagar IV,New Delhi 110 024Tel: 91-11-26447160Fax: 91-11-26447156Website: www.asiaelsevier.comISBN: 81-8147-754-5Academic Press, Butterworth-Heinemann, Digital Press, Focal Press, MorganKaufmann, North Holland and Pergamon are the Science and Technology imprints ofElsevier.Printed and bound in India