Thanks to:

Alberto González Palomo - Alberto.Gonzalez@matracas.org
Petr Savicky - savicky@cs.cas.cz
Erich Neuwirth - erich.neuwirth@univie.ac.at
Simon Blomberg - simonb@cres10.anu.edu.au
David Winsemius - dwinsemius@comcast.net
