1. Least squares model fitting to fuzzy linear data;Celmiņš;Fuzzy Sets and Systems,1987
2. Multidimensional least squares fitting of fuzzy models;Celmiņš;Mathematical Modelling,1988
3. Fuzzy least squares;Diamond;Inform. Sci.,1988
4. Least squares fitting of several fuzzy variables;Diamond,1987
5. Fuzzy kriging;Diamond;Fuzzy Sets and Systems,1989