Superposition of a static perfect fluid and a radial elecric field
  We obtain a two-parameter set of solutions, which represents a spherically symmetric space-time with a superposition of a neutral fluid and an electric field. The electromagnetic four-potential of this Einstein-Maxwell space-time is taken in the form A=(q/n)(r^n)dt, when n=/0 and A=q*ln(r)dt, when n=0 (where q and n are arbitrary constants) 
Mauricio Cataldo (Universidad del Bio-Bio, Chile), Patricio Salgado   (Universidad de Concepcion, Chile)