References

Donald E. Knuth
    The Computer as Master Mind. J. Recreational Mathematics, 9 (1976-77), 1-6.

Irving, R. W.
    Towards an Optimum Mastermind Strategy,  Journal of Recreational Mathematics,
        Vol 11(2), 19781979
 
Kenji Koyama, Tony W. Lai.
    An optimal Mastermind Strategy. Journal of Recreational Mathematics, Vol. 25(4) 251-256, 1993.