1. American Put Option Comparison (mathematica program)
  2. American Put Option: Numerical Scheme (mathematica program)
  3. (with  Chadam) A mathematical Analysisfor the optimal exercise boundary of American put option (rigorous mathematical annlysis paper)
  4. (with Chadam & Stamicar)The  optimal exercise boundary for  American put options: analytic and numerical approximations (numrical result paper)