Renormalization in a Lorentz-violating model and higher-order operators J. R. Nascimento, A. Yu. Petrov and Carlos M. Reyes Eur. Phys. J. C, 78 7 (2018) 541 Published online: 02 July 2018 DOI: 10.1140/epjc/s10052-018-6018-3