A Computer Program for the Newman-Janis Algorithm
  A REDUCE code for the Newman-Janis algorithm is described. This algorithm is intended to include rotation into nonrotating solutions of the Einstein field equations with spherically symmetry or perturbed spherically symmetry and has been successfully applied to many spacetimes. The applicability of the code is restricted to metrics containing potentials of the form 1/r. 
Carlos Gutierrez-Chavez, Francisco Frutos-Alfaro, Ivan Cordero-Garcia
gr-qc astro-ph.CO