On general ultraviolet properties of a class of confining propagatorsM. A. L. Capri, M. S. Guimaraes, I. F. Justo, L. F. Palhares and S. P. SorellaEur. Phys. J. C, 76 3 (2016) 141DOI: https://doi.org/10.1140/epjc/s10052-016-3974-3