1. V. A. Epanechnikov, Theory Probab. Appl. 14 (1), 153–158 (1969).
2. A. A. Borovkov, Mathematical Statistics (Nauka, Novosibirsk, 1997) [in Russian].
3. G. A. Mikhailov, S. M. Prigarin, and S. A. Rozhenko, Dokl. Math. 96 (2), 461–464 (2017).
4. G. Z. Lotova, Russ. J. Math. Math. Model. 31 (6), 369–377 (2016).
5. N. N. Chentsov, Statistical Decision Rules and Optimal Inference (Nauka, Moscow, 1972