The all-loop perturbative derivation of the NSVZ 
-function and the NSVZ scheme in the non-Abelian case by summing singular contributions
Eur. Phys. J. C, 80 9 (2020) 911
Published online: 21 September 2020
DOI: 10.1140/epjc/s10052-020-8416-6