Butterworth-Heinemann An imprint of Elsevier Science Linacre House, Jordan Hill, Oxford OX2 8DP 22 Wheeler Road, Burlington MA 01803 First published 1991 Paperback edition 1993 Reprinted 1993, 1995 (twice), 1997, 1998, 1999, 2000 Second edition 2003 Copyright 0 1991, 2003, Elsevier Science Ltd. 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.