MOTION ALONG POLAR ORBITS IN THE KERR-NEWMAN SPACETIME Статья Cindra J.L. Classical and Quantum Gravity. Том 6. 1989. С. 857-865
ON THE GRAVITATIONAL FIELD OF A MASS ENDOWED WITH MAGNETIC DIPOLE MOMENT Статья Gutsunaev Ts.I., Elsgolts S.L. Classical and Quantum Gravity. Том 4. 1987. С. L211-L213
A CONFORMALLY INVARIANT THEORY OF GRAVITATION AND ELECTROMAGNETISM Статья Merkulov S.A. Classical and Quantum Gravity. Том 1. 1984. С. 349-354