First published by Pergamon Press Ltd 1993 Reprinted 1996 ©Butterworth Heinemann Ltd 1993 Reprinted in 1999 by Butterworth-Heinemann is an imprint of Elsevier. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. This book is printed on acid-free paper. Library of Congress Cataloging-in-Publication Data Lai, W
