* This program is based on work by
* Isabella Bierenbaum <bierenbaum@thep.physik.uni-mainz.de> and
* Dirk Kreimer <dkreimer@bu.edu>.
* This program is based on work by
* Isabella Bierenbaum <bierenbaum@thep.physik.uni-mainz.de> and
* Dirk Kreimer <dkreimer@bu.edu>.