All Rights Reserved No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission from the Publisher, with the exception of any material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Printed in the Netherlands © 2006 Springer www.springer.com ISBN-13

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... 8-1-4020-4898-2 (HB) ISBN-10 1-4020-4899-8 (e-book) ISBN-10 1-4020-4898-X (HB) ISBN-13 978-1-4020-4899-9 (e-book) This book is dedicated to the world's vagabonds: for Stephen, who made it, and others who didn't.