(1) Institut für Theoretische Physik, Universität Zürich, 8057 Zürich, Switzerland; grigore(at)physik.unizh.ch, scharf(at)physik.unizh.ch; (2) permanent address: Department of Theoretical Physics, National Institute of Physics and Nuclear Engineering, P.O. Box MG-6, 76900 Bucharest-Magurele, Romania
Received 10 March 2003, revised 25 August 2003, accepted 26 September
2003 by K. Fredenhagen
(approx. 39 pages)
Department of Physics, Faculty of Engineering, Gaziantep University, 27310 Gaziantep, Turkey; koc(at)gantep.edu.tr
Received 15 July 2003, revised 1 October 2003,
accepted 2 October 2003 by U. Eckern
(approx. 8 pages)
Department of Mechanical Engineering, 2540 Dole Street, Holmes Hall 302, Honolulu, Hi 96822, USA; coimbra(at)hawaii.edu
Received 8 September 2003, revised 29 September 2003,
accepted 5 October 2003 by F. W. Hehl
(approx. 12 pages)
(1) Department de Physique, Universite de Fribourg, 1700 Fribourg, Switzerland; (2) Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland; (3) Laboratoire de Physique Theorique et Hautes Energies, CNRS UMR 7589, Universite Paris VI, 75252 Paris Cedex 05, France; benedikt.binz(at)unifr.ch
Received 2 October 2003, accepted 7 October 2003 by U. Eckern
(approx. 32 pages)