On general ultraviolet properties of a class of confining propagators M. A. L. Capri, M. S. Guimaraes, I. F. Justo, L. F. Palhares and S. P. Sorella Eur. Phys. J. C, 76 3 (2016) 141 Published online: 14 March 2016 DOI: 10.1140/epjc/s10052-016-3974-3