Andreas Aste University of Basel & Paul Scherrer Institute http://quasar.unibas.ch/~aste/ Papers Non-abelian gauge theories as a consequence of perturbative quantum gauge invariance Andreas Aste, Günter Scharf March 02, 1998 open access link Int.J.Mod.Phys. A14 (1999) 3421-3434 On Gauge Invariance and Spontaneous Symmetry Breaking Andreas Aste, Michael Dütsch, Günter Scharf May 28, 1997 open access link J.Phys.A30:5785-5792,1997 Perturbative gauge invariance: electroweak theory II Andreas Aste, Michael Dütsch, Günter Scharf February 06, 1997 open access link Annalen Phys.8:389-404,1999