Charged fields, Higgs phenomenon and confinement. Lesson from soluble models G. Morchio — 1996 Annales de l'I.H.P. Physique théorique
Infrared singularities, vacuum structure and pure phases in local quantum field theory G. Morchio; F. Strocchi — 1980 Annales de l'I.H.P. Physique théorique