The Pseudo-Newtonian Force and Potential of the Stringy Black Holes
  This paper is devoted to investigate the structure of the pseudo-Newtonian force and potential of the stringy black holes. We discuss conditions for the force character from an attractive to repulsive. It is also found that the force will reach a maximum under certain conditions. Also, the ratio of mass and charge is evaluated for the maximum force. 
M. Sharif
gr-qc