sven....any article in Civil Engineering magazine is copyrighted and cannot be reprinted here...I have been published in CE magazine and I have to buy my own article!
As for the subject, there have been many article written on this and there have been discussions here in Eng-Tips. Do a search and see what you find.
Unless you have a specific forensic need, this is an old article and it would be somewhat irrelevant to today's requirements.