Zero value for the three-loop. beta. function in N=4 supersymmetric Yang-Mills theory

@article{Grisaru1980ZeroVF,
  title={Zero value for the three-loop. beta. function in N=4 supersymmetric Yang-Mills theory},
  author={M. Grisaru and M. Ro{\vc}ek and W. Siegel},
  journal={Physical Review Letters},
  year={1980},
  volume={45},
  pages={1063-1066}
}
This Letter describes a calculation using superfield techniques, showing that the ..beta.. function is zero to three loops in N=4 supersymmetric Yang-Mills theory. This result gives further indication that the theory is likely to be finite and conformally invariant order by order in perturbation theory. 
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