Litovchenko, V. A. “Holtsmark Fluctuations of Non-Stationary Gravitational Fields”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 1 (January 22, 2021): 69 - 76. Accessed August 9, 2022. http://umj.imath.kiev.ua/index.php/umj/article/view/6113.