1. I. I. Eremin, “Duality for improper problems of linear and convex programming,” Soviet Math. Dokl. 23, 62–66 (1981).
2. I. I. Eremin, Vl. D. Mazurov, and N. N. Astaf’ev, Improper Problems of Linear and Convex Programming (Nauka, Moscow, 1983) [in Russian].
3. A. N. Tikhonov and V. Ya. Arsenin, Solutions of Ill-Posed Problems (Nauka, Moscow, 1979; Wiley, New York, 1981).
4. F. P. Vasil’ev, Methods for Solving Extremal Problems (Nauka, Moscow, 1981) [in Russian].
5. V. D. Skarin, “An approach to the analysis of improper linear programming problems,” USSR Comp. Math. Math. Phys. 26 (2), 73–79 (1986).