Anisotropic compact stars in higher-order curvature theory G. G. L. Nashed, S. D. Odintsov and V. K. Oikonomou Eur. Phys. J. C, 81 6 (2021) 528 Published online: 21 June 2021 DOI: 10.1140/epjc/s10052-021-09321-3