1. S.D. Majumdar, A class of exact solutions of Einstein’s field equations, Phys. Rev. 72 (1947) 390 [ INSPIRE ].
2. A. Papaetrou, A Static solution of the equations of the gravitational field for an arbitrary charge distribution, Proc. Roy. Irish Acad. A 51 (1947) 191 [ INSPIRE ].
3. A. Einstein and J. Grommer, Allgemeine Relativitätstheorie und Bewegungsgesetz, S. B. Preuss. Akad. Wiss. 1 (1927) 2.
4. A. Einstein, L. Infeld and B. Hoffmann, The Gravitational equations and the problem of motion, Annals Math. 39 (1938) 65 [ INSPIRE ].
5. V.A. Fock, Sur le mouvement de masses finies d’apres la théorie de gravitation einsteinienne, J. Phys. U.S.S.R. 1 (1939) 81.