Propositional Rules and Regression
    Propositional Rule-Based Regression in Trading, Advances in Knowledge Discovery and Data Mining (Chapter 22)
     S&P 500, classification rules for numerical prediction and an investment policy. DNF and Rule-based Regression.
Propositional Rules and Neural Network
A rule-based Neural Stock Trading Decision Support System, S. T. Chou, C.Yang, C.Chen and F. Lai
          Computational Intelligence for Financial Engineering 1996, IEEE NN Council, pp. 148-154.
          Understanding Time-Series Networks: a Case Study in Rule Extraction, M. W. Craven and J. W. Shavlik,
          International  Journal of Neural Systems, 1997