1. P. Schupp, Talk given at the Bayrischzell workshop on Noncommutativity and Physics, Bayrischzell May 11–14, 2007, http://homepage.univie.ac.at/michael.wohlgenannt/bzell/Bayrischzell_Workshop_2007.html, and at the Conference on noncommutative geometry and physics, Orsay, Paris 2007, http://www.th.u-psud.fr/page_perso/Rivasseau/NONCOM07/, and at the 4th Central European Seminar, on Particle physics and quantum field theory, Commutative and noncommutative quantum fields, Nov. 30–Dec. 02, 2007 University of Vienna, Faculty of Physics, http://www.univie.ac.at/vienna.seminar/2007/abstracts/abstr_Schupp.html
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