Kisel, V. V., E. M. Ovsiyuk, A. V. Ivashkevich, and V. M. Red’kov. 2019. “Fradkin Equation for a Spin-3/2 Particle in the Presence of External Electromagnetic and Gravitational Fields”. Ukrainian Journal of Physics 64 (12):1112. https://doi.org/10.15407/ujpe64.12.1112.