1. H.J.W. Müller-Kirsten and A. Wiedemann, Collective coordinates, Dirac constraints and quantisation of systems with many degrees of freedoom, University of Kaiserslautern report, to be published in Nuovo Cimento A.
2. H.J.W. Müller-Kirsten and A. Wiedemann, Application of the method of collective coordinates to the quantisation of the two-dimensional Higgs model, University of Kaiserslautern report, to be published in Fortschr. Phys.
3. A perturbation technique which is superior to the weak-coupling WKB method
4. Matching of WKB solutions to other solutions