Skorokhodov, D. S. “Landau-Kolmogorov Problem for a Class of Functions Absolutely Monotone on a Finite Interval”.
Ukrains’kyi Matematychnyi Zhurnal
, vol. 63, no. 4, Apr. 2011, pp. 531-48,
https://umj.imath.kiev.ua/index.php/umj/article/view/2739
.