1. H. Tuy, “D. C. Optimization: Theory, Methods and Algorithms,” in: Handbook of Global Optimization, Ed. by R. Horst R and P.M. Pardalos (Kluwer Academic Publishers, 1995), Vol. 2, pp. 149–216.
2. J. B. Hiriart-Urruty, “Conditions for Global Optimality,” Handbook of Global Optimization, Ed. by R. Horst and P.M. Pardalos (Kluwer Academic Publishers, 1995), Vol. 2, pp. 1–26.
3. A. S. Strekalovskii, Elements of Nonconvex Optimization (Nauka, Novosibirsk, 2003) [in Russian].
4. F. P. Vasil’ev, Optimization Methods (Faktorial Press, Moscow, 2002) [in Russian].