Koshanov, B.D., Kakharman, N., Segizbayeva, R.U., & Sultangaziyeva, Zh.B. (2022). Two theorems on estimates for solutions of one class of nonlinear equations in a finite-dimensional space. Bulletin of the Karaganda University. Mathematics Series, 3(107), 70–84. https://doi.org/10.31489/2022m3/70-84