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Pergamon Press Ltd., Headington Hül Hall, Oxford 0X3 OBW Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, New York 10523 Pergamon of Canada Ltd., 207, Queen's Quay West, Toronto 117, Canada Pergamon Press (Aust.) Ptv. Ltd., 19a Rushcutters Bay, Sydney, N.S.W. 2011 Friedr. Vieweg + Sohn GmbH, Burgplatz 1, D - 3 3 Braunschweig, Germany-West 1974 All rights reserved Copyright © 1974 by Friedr. Vieweg + Sohn GmbH, Verlag, Braunschweig Library of Congress Catalog Card No. 64-3554 No part of this pubhcation may be reproduced, stored in a retrieval system or transmitted, mechanical, photocopying, recording or otherwise, without prior permission of the copyright holder. Set by Friedr. Vieweg + Sohn GmbH, Braunschweig Printed by E. Hunold, Braunschweig Bookbinder: W. Langelüddecke, Braunschweig Printed in Gemiany-West ISBN 0 08 017287 3 (Pergamon) ISBN 3 528 08115 5 (Vieweg)