VronskiiB. M. “On Small Motions of a ‘liquid-gas’ System in a Bounded Domain”. Ukrains’kyi Matematychnyi Zhurnal 58, no. 10 (October 25, 2006): 1326–1334. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3535.