Heun-type solutions for the Dirac particle on the curved background of Minkowski space-times S. Rahmani, H. Panahi and A. Najafizade Eur. Phys. J. Plus, 139 6 (2024) 463 Published online: 01 June 2024 DOI: 10.1140/epjp/s13360-024-05256-2