Linacre House, Jordan Hill, Oxford OX2 SDP a division of reed Educational an Q Amember of the Reed Elsevier plc group OXFORD BOSTON JOHANNESBURG MELBOURNE NEW DELHI SINGAPORE Reed Educational and Professional Publishing Ltd 1997 medium by electronic means and whether or ot transiently or incidentally to some other use of this ublication)without the written permission of the copyrigh holder except 90 Tottenham Court road Applications for the copyright holde eproduce any part of this publication should be addressed to the publishers British Library Cataloguing in Publication Data available from the British Library Library of Congress Cataloguing in Publication Data A catalogue record for this book is available from the Library of Congress ISBN0750605618 und in Great Britain by Martins the Printer, Berwick-upon-TweedButterworth-Heinemann Linacre House, Jordan -1, Oxford OX2 8DP A division of Reed Educational and Professional Publishing Ltd. -@ member of the Reed Elsevier PIC group OXFORD BOSTON JOHANNESBURG MELBOURNE NEW DELM SINGAPORE First published 1997 8 Reed Educational and Professional Publishing Ltd 1997 All rights reserved. No part of this publication may be reproduced in any material form (including photocopying or storing in any medium by electronic means and whether or not transiently or incidentally to some other use of this publication) without the written permission of the copyright holder except in accordance with the provisions of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London, England W1P 9HE. Applications for the copyright holder’s written permission to reproduce any part of this publication should be addressed to the publishers. British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library Library of Congress Cataloguing in Publication Data A catalogue record for this book is available from the Library of Congress. ISBN 0 7506 0561 8 Composition by University of Greenwich (formerly Thames Polytechnic) Printed and Bound in Great Britain by Martins the Printer, Berwick-upon-Tweed