Chanas S, Kuchta D. Multiobjective programming in optimization of interval objective functions-a generalized approach [J]. European Journal of Operational Research, 1996, 94: 594-598.
Sengupta A, Pal T K, Chakraborty D. Interpretation of inequality constraints involving interval coefficients and a solution to interval linear programming[J]. Fuzzy Sets and Systems, 2001, 119: 129-138.
Ida M.Portfolio selection problem with interval coefficients [J]. Applied Mathematics Letters, 2003, 16(5): 709-713.
[12]
Giove S, Funari S, Nardelli C. An interval portfolio problem based on regret function [J]. European Journal of perational Research, 2006, 170: 253-264.