Regularity condition on the anisotropy induced by gravitational decoupling in the framework of MGD G. Abellán, V. A. Torres-Sánchez, E. Fuenmayor and E. Contreras Eur. Phys. J. C, 80 2 (2020) 177 Published online: 26 February 2020 DOI: 10.1140/epjc/s10052-020-7749-5