After this paper was put up on the net, I've had quite a few emails about them. Some of them has pointed out bugs etc.
Among the ones I want to say thanks to for making improving suggestions and pointing out bugs are
Jens Larsson <firstname.lastname@example.org>
Michael L Locher
Steve Bellantoni <email@example.com>
Steven Leadbeater <firstname.lastname@example.org>
Lotti Luca, Milano, Italy