1. H. Osborn “Remiclassical methods for Quantizing monopole field configurations” Proceedings of the Monopole Meeting, Trieste, Italy, December 1981, Ed. N.S. Craigie, P. Goddard, W. Nahm, World Scientific, Singapore 1982
2. Some general references on collective coordinates are: Y. WATANABE, Prog. Theor. Phys. 16, 1 1956; A. HOSOYA and K. KIKKAWA, Nucl. Phys. B 101. 271 1975; A. V. SHURGAYA, Teor. Mat. Fiz.45,46 1980 translation: Theor. Math. Phys. 45. 873 1980; E. TOMBOULIS and G. Woo, Ann. Phys. N.Y. 98, 1 1976; E. TOMBOULIS, Phys. Rev. D 12, 1678 1975
3. Semiclassical Approximations in Field Theory