Copyright ® 1997, 1998, 1999 by Bill T. Ray

Permission is granted to students at Southern Illinois University at Carbondale to make one copy of this material for use in an appropriate class taught by the author. No other permission is granted.

All other rights are 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 copyright owner.

For permission to use copyrighted material contact Bill T. Ray at  ray@engr.siu.edu.