Gravitational lensing by spherically symmetric lenses with angular   momentum
  Following Sereno (2002a), we discuss the bending of light rays by spherically symmetric lenses with angular momentum. For several astrophysical systems, such as white dwarfs and galaxies, gravitomagnetism induces a correction on the deflection angle as large as 0.1%. 
M. Sereno, V.F. CArdone