Anisotropic constant-roll inflation for the Dirac–Born–Infeld model Duy H. Nguyen, Tuyen M. Pham and Tuan Q. Do Eur. Phys. J. C, 81 9 (2021) 839 Published online: 21 September 2021 DOI: 10.1140/epjc/s10052-021-09652-1