1. E. A. Artyukhin and A. S. Okhapkin, Inzh.-Fiz. Zh.,45, No. 5, 781?788 (1983).
2. S. M. Ermakov (ed.), The Mathematical Theory of Experiment Planning [in Russian], Moscow (1983).
3. S. D. Williams and D. M. Curryt, J. Spacecr. Rockets,44, No. 10, 632?637 (1977).
4. S. B. Stechkin and Yu. N. Subbotin, Splines in Computational Mathematics [in Russian], Moscow (1976).
5. A. A. Samarskii, Difference-Scheme Theory [in Russian], Moscow (1977).