Many thanks to:
Apollo 440, Ashley Krajewski, Paul Kodish, Joachim Langer, Dirk Dreyer,
Andrew Sutton, Axel Lünebach, Doug Ross, Mark Wasiel, Andrew Nestler,
Peter Visontay, Johannes Mertmann, Jon Jenssen, Jon Masciana,
Peter Cornely, John Field, Graham Reed, Miles Sturt,
Meike Pabst, Michael Szweblik, Mathias Blühdorn, Jan Justesen,
Nick Stutley and Ralph Schneider.
Comments, additions, corrections, questions, etc. always welcome.