Gerrit Verschuur University of Memphis Memphis, TN 38002

Library of Congress Control Number: 2006924881

ISBN-10: 0-387-30816-4 Printed on acid-free paper

ISBN-13: 978-0387-30816-6

Printed on acid-free paper.

©2007 Springer Science+Business Media. LLC

All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media. LLC. 233 Spring Street, New York. NY 10013. USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.

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Dedicated to the memory of Heinrich cmd Elisabeth Hertz who lit the spark that illuminated the invisible universe.

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