Spinor fields in spherical symmetry: Einstein–Dirac and other space-times K. A. Bronnikov, Yu. P. Rybakov and Bijan Saha Eur. Phys. J. Plus, 135 1 (2020) 124 Published online: 23 January 2020 DOI: 10.1140/epjp/s13360-020-00150-z