1. B.N. Pshenichnyi, The Linearization Method for Constrained Optimization, Springer-Verlag, (1994).
2. B.N. Pshenichnyi and K.V. Nashempa, Linearization Method for Constrained Limit Extremal Problems, Kibernetika i Sistemnyi Analiz, No. 6, 120127, (1992).
3. Yu.M. Ermol’ev and E.A. Nurminskii, Limit Extremal Problems, Kibernetika, No. 4, 130–132 (1973).
4. V.I. Ivanov, Limit Extremal Problems, Mathematica Balkanica, New Series Vol. 17, Fasc. 3–4, 221–230, (2003).
5. W. Rudin, Principles of Mathematical Analysis, McGraw-Hill, 3rd Edition, (1976).