1. V. A. Yatsuk and P. S. Malachivskyy, Methods to Improve Measurement Accuracy [in Ukrainian], Beskid Bit, Lviv (2008).
2. T. Bubela, P. Malachivskyy, Y. Pokhodylo, M. Mykyychuk, and O. Vorobets, “Mathematical modeling of soil acidity by the admittance parameters,” Eastern-European J. of Enterprise Technologies, Vol. 6, No. 10 (84), 4–9 (2016).
3. L. Collatz and W. Krabs, Approximation Theory. Chebyshev Approximations and their Applications [Russian translation], Nauka, Moscow (1978).
4. P. S. Malachivskyy, Y. N. Matviychuk, Ya. V. Pizyur, and R. P. Malachivskyi, “Uniform approximation of functions of two variables,” Cybern. Syst. Analysis, Vol. 53, No. 3, 426–431 (2017).
5. A. O. Kalenchuk-Porkhanova and L. P. Vakal, “Constructing the best uniform approximations of functions of several variables,” Comp. Zasoby, Merezhi ta Systemy, No. 6, 141–148 (2007).