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Advanced Materials Research Vols. 20-21 (2007) pp 655-658
online at http://www.scientific.net
© (2007) Trans Tech Publications, Switzerland
Online available since 2007/Jul/15
All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of the
publisher: Trans Tech Publications Ltd, Switzerland, www.ttp.net. (ID: 130.203.133.34-14/04/08,12:41:07)