Interval regression analysis by quadratic programming approach. - Hideo Tanaka; Haekwan Lee (IEEE Trans. Fuzzy Syst., 1998)

Upper and lower approximation models in interval regression using regression quantile techniques. - Haekwan Lee; Hideo Tanaka (Eur. J. Oper. Res., 1999)

Exponential possibility regression analysis by identification method of possibilistic coefficients. - Hideo Tanaka; Haekwan Lee (Fuzzy Sets Syst., 1999)

Interval Regression Analysis with Polynomials and Its Similarity to Rough Sets Concept. - Hideo Tanaka; Haekwan Lee (Fundam. Informaticae, 1999)