1. A. P. Khusu, Yu. R. Vittenberg, and V. A. Pal’mov, Surface Roughness [in Russian], Nauka, Moscow (1975).
2. V. N. Vapnik, Estimation of Dependences based on Empirical Data, Springer (2006).
3. M. I. Schlesinger and V. Hlaváč, Ten Lectures on Statistical and Structural Pattern Recognition, Kluwer Acad. Publ., Dordrecht (2002).
4. P. S. Knopov, Optimal Estimates for the Parameters of Stochastic Systems [in Russian], Naukova Dumka, Kyiv (1981).
5. A. Ya. Dorogovtsev, Theory of Estimates of the Parameters of Random Processes [in Russian], Vyshcha Shkola, Kyiv (1982).