BOTTARI, A., and B. FEDERICO. “Travel Time Analysis of P Waves Arising from Six Underground Nuclear Explosion at Novaya Zemlya”. Annals of Geophysics 30, no. 1-2 (November 25, 1977): 83–106. Accessed September 25, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4815.