TY JOUR TI The nonrelativistic approximation for a spin 3/2 particle in gravitation field KW spin 3/2 particle KW non-relativistic approximation KW projective operators KW external electromagnetic and gravitational fields JO Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences AU Ivashkevich, A.V. PY 2025 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"