Meletlidis, Stavros, et al. “New Insight into the 2011-2012 Unrest and Eruption of El Hierro Island (Canary Islands) Based on Integrated Geophysical, Geodetical and Petrological Data”. Annals of Geophysics, vol. 58, no. 5, Nov. 2015, p. S0546, https://doi.org/10.4401/ag-6754.