Institut für Theoretische Physik, Universität zu Köln, 50937 Köln,
Germany; rf (at) thp.uni-koeln.de
Received 24 May 2011, revised 4 Aug 2011, accepted 9 Aug 2011 by F. W. Hehl
Departamento de Fisica, Universidade Federal de Santa Catarina, Trindade 88040-900,
Florianopolis, SC, Brazil; armando.assis (at) pgfsc.ufsc.br
Received 4 Apr 2011, revised 27 Jul 2011, accepted 17 Jul 2011 by B. Kramer
Universidade Federal de Campina Grande, Brazil / Universidade Federal de Paraibo, Brazil;
cleversonfilgueiras (at) yahoo.com.br
Received 30 Nov 2010, revised 16 Aug 2011, accepted 17 Aug 2011 by B. Kramer
Universidade Federal de Paraibo / Universidade Federal do Espirito Santo / Universidade
Federal Maranhao, Brazil; kbakke (at) fisica.ufpb.br
Received 10 May 2011, revised 28 Jun 2011, accepted 22 Aug 2011 by F. W. Hehl
Friedrich-Schiller-Universität Jena, Germany / Universidade Tecnica de Lisboa,
Portugal; johannes.hartung (at) uni-jena.de
Received 21 Jul 2011, accepted 26 Aug 2011 by F. W. Hehl
Universite de Cergy-Pontoise, France / Sofia University, Bulgaria;
rossen.dandoloff (at) u-cergy.fr / vatanasov (at) gmail.com
Received 14 Jun 2011, revised 14 August 2011, accepted 5 Sep 2011 by U. Eckern
Max Planck Institute for Brain Research, 60528 Frankfurt / Frankfurt Institute for Advanced
Studies, 60438 Frankfurt, Germany;
yushan.mail (at) gmail.com / danko.nikolic (at) googlemail.com
Received 19 Apr 2011, revised 12 Sep 2011, accepted 16 Sep 2011 by U. Eckern
University of Concepcion, P.O. Box 160-C, Concepcion, Chile; sbruce (at) udec.cl
Received 26 May 2011, accepted 16 Sep 2011 by A. Wipf
Potsdam Institute for Climate Impact Research (PIK), 14412 Potsdam, Germany;
feulner (at) pik-potsdam.de
Received 28 Jul 2011, accepted 10 Aug 2011 by U. Eckern
Institut für Physik, TU Dortmund, 44221 Dortmund, Germany;
werner.weber (at) tu-dortmund.de
Received 28 Jul 2011, accepted 10 Aug 2011 by U. Eckern
andres.cantarero (at) uv.es
Received 10 Aug 2011, accepted 31 Aug 2011 by U. Eckern