1. Bonnor, W.B.: The equilibrium of a charged test particle in the field of a spherical charged mass in general relativity. Class. Quant. Grav. 10, 2077 (1993)
2. Perry, G.P., Cooperstock, F.I.: Electrostatic equilibrium of two spherical charged masses in general relativity. Class. Quant. Grav. 14, 1329 (1997).
arXiv:gr-qc/9611066
3. Alekseev, G.A., Belinski, V.A.: Equilibrium configurations of two charged masses in general relativity. Phys. Rev. D 76, 021501(R) (2007).
arXiv:0706.1981
[gr-qc]
4. Alekseev, G.A., Belinski, V.A.: Superposition of fields of two Reissner–Nordstrom sources. In: Kleinert, H., Jantzen, R.T., Ruffini, R. (eds.) Proceedings of the Eleventh Marcel Grossmann Meeting on General Relativity (Berlin, Germany 2007), Part A: Plenary and Review Talks (World Scientific, Singapore, 2008), p. 543.
arXiv:0710.2515
[gr-qc]
5. Belinski, V., Zakharov, V.: Integration of the Einstein Equations by means of the inverse scattering problem technique and construction of exact soliton solutions. Sov. Phys. JETP 48, 985 (1978)