A theorem on analytical calculability of 4-loop renormalization group functions

@article{Tkachov1981ATO,
  title={A theorem on analytical calculability of 4-loop renormalization group functions},
  author={F. Tkachov},
  journal={Physics Letters B},
  year={1981},
  volume={100},
  pages={65-68}
}
A method of evaluating massless propagator-type Feynman integrals is outlined, which guarantees that the counterterm of an arbitrary 4-loop diagram can be calculated analytically within the minimal substraction scheme. 
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