Kotov, Valery, and Vasilii Haneychuk. “Sixfold Enhancement of Solar Pulsations: 1974–2018”. Acta Astrophysica Taurica 4, no. 2 (November 9, 2023): 1–5. Accessed November 21, 2024. https://astrophysicatauricum.org/index.php/aat/article/view/60.