Non-Abelian aether-like term in four dimensions A. J. G. Carvalho, D. R. Granado, J. R. Nascimento and A. Yu. Petrov Eur. Phys. J. C, 79 10 (2019) 817 Published online: 04 October 2019 DOI: 10.1140/epjc/s10052-019-7342-y