1. V.S. Vanyashin and M.V. Terent’ev, The vacuum polarization of a charged vector field, Sov. Phys. JETP 21 (1965) 375.
2. I.B. Khriplovich, Green’s functions in theories with non-abelian gauge group., Sov. J. Nucl. Phys. 10 (1969) 235 [ INSPIRE ].
3. G. ’t Hooft, report at the Colloquium on Renormalization of Yang-Mills Fields and Applications to Particle Physics, Marseille, France, June 1972, unpublished.
4. D.J. Gross and F. Wilczek, Ultraviolet Behavior of Nonabelian Gauge Theories, Phys. Rev. Lett. 30 (1973) 1343 [ INSPIRE ].
5. H.D. Politzer, Reliable Perturbative Results for Strong Interactions?, Phys. Rev. Lett. 30 (1973) 1346 [ INSPIRE ].