Lin, Jyh-Woei. “Early Warning of Tsunami from Seismo-Ionospheric Fluctuation After Japan’s March 11, 2011, M=9.0 Tohoku Earthquake Using Two-Dimensional Principal Component Analysis”. Annals of Geophysics 58, no. 4 (October 1, 2015): A0442. Accessed April 28, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/6710.