Dyukarev, Yu. M., and Rivero A. E. Choque. “An Interpolation Problem in the Class $R[a,b]$”. Ukrains’kyi Matematychnyi Zhurnal 55, no. 8 (August 25, 2003): 1044-1057. Accessed May 9, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3980.