1. Castellano, C., Cucci, L., Tertulliani, A., and Pierantonio, G., Rotational effects associated with ground motion during the Mw 6.3 2009 L’Aquila (Central Italy) earthquake, Boll. Geofis. Teor. Appl., 2012, vol. 53, no. 3, pp. 299–312. doi 10.4430/bgta0045
2. Cecchi, F., Sismografo elettrico a carte affumicate scorrevoli, Atti Pontif. Accad. Nuovi Lincei, A, vol. XXIX, Rome, 1876, pp. 421–428.
3. Chiu, H.C., Wu, F.J., and Huang, H.C., Rotational motions recorded at Hualien during the 2012 Wutai, Taiwan earthquake, Terr., Atmos. Ocean. Sci. J., 2013, vol. 24, pp. 31–40. doi 10.3319/TAO.2012.10.22.01(T)
4. Daily Mail Day the Earth moved: How the earthquake tilted the world’s axis by 25cm (and could even cost us a microsecond a day), 2011. http://www.dailymail.co.uk/sciencetech/article-1365821/Japan-earthquake-tsunami-Earths-day-length-shortened-axis-tilted-25cm.html. Accessed February 1, 2018.
5. Ferrari, G., Note on the historical rotation seismographs, in Earthquake Source Asymmetry, Structural Media and Rotation Effects, Teisseyre, R., Takeo, M., and Majewski, E., Eds., Berlin: Springer, 2006, pp. 367–376.