BugirM.K. 2024. “Theorems on the Average Values and Non-Oscillating Character of the Solutions of the Partial Differential Equations in the Spaces $E^n$ and $P^n$ ”. Ukrains’kyi Matematychnyi Zhurnal 44 (11), 1477-83. https://umj.imath.kiev.ua/index.php/umj/article/view/8248.