Approximation of differentiable functions by polynomial splines in domains with external peaks

SemenyukV. B. “Approximation of Differentiable Functions by Polynomial Splines in Domains With External Peaks”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 46, no. 9, Sept. 1994, pp. 1224–1233, https://umj.imath.kiev.ua/index.php/umj/article/view/5639.