Infinite mass renormalization and the Z = 0 condition E. Tirapegui — 1972 Annales de l'I.H.P. Physique théorique
Composite propagator and the equivalence theorem in the Z 3 = 0 theory V. Massidda; E. Tirapegui — 1969 Annales de l'I.H.P. Physique théorique