Zimmermann, Reduction in the number of coupling parameters, vol. 97, 1985, Bibcode:1985CMaPh..97..211Z, DOI:10.1007/bf01206187., Oehme, Zimmermann: Relations Between Effective Couplings for Asymptotically Free Models, ibid. p. 586
Oehme, Zimmermann, Quark and gluon propagators in quantum chromodynamics, vol. 21, 1980, DOI:10.1103/PhysRevD.21.471.
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Zimmermann, Reduction in the number of coupling parameters, vol. 97, 1985, Bibcode:1985CMaPh..97..211Z, DOI:10.1007/bf01206187., Oehme, Zimmermann: Relations Between Effective Couplings for Asymptotically Free Models, ibid. p. 586