1. G. G. Skorik, Eurasian J. Math. Comput. Appl. 6 (1), 56–64 (2018).
2. G. G. Skorik and V. V. Vasin, Eurasian J. Math. Comput. Appl. 7 (2), 79–88 (2019).
3. F. P. Vasil’ev, Optimization Methods (MTsNMO, Moscow, 2011), Vol. 1 [in Russian].
4. V. V. Vasin and I. I. Eremin, Operators and Iterative Processes of Fejér Type: Theory and Applications (Walter de Gruyter, Berlin, 2009).
5. K. G. Gribanov, V. I. Zakharov, S. A. Tashkun, et al., J. Quant. Spectrosc. Radiat. Transfer 68 (4), 435–451 (2001).