RadzievskayaE. I., & RadzievskiiG. V. (2003). Estimation of a <em class="a-plus-plus">K</em>-Functional of Higher Order in Terms of a <em class="a-plus-plus">K</em&gt;-Functional of Lower Order. Ukrains’kyi Matematychnyi Zhurnal, 55(11), 1530-1540. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4022