Classes of exact static spheroidal Einstein-Maxwell solutions
  In this paper we study the spheroidal cases of static charged fluid configurations in general relativity. We consider the effect of the anisotropic stresses of electromagnetic field on the shape of static charged self-graviting objects. It is shown that electromagnetic fields can have significant effect on the structure and properties of self-graviting objects. 
S.M. Kozyrev
gr-qc astro-ph.CO