Babenko, V. F., and N. V. Parfinovych. 2016. “Estimation of the Uniform Norm of One-Dimensional Riesz Potential of a Partial Derivative of a Function With Bounded Laplacian”. Ukrains’kyi Matematychnyi Zhurnal 68 (7), 867-78. https://umj.imath.kiev.ua/index.php/umj/article/view/1887.