Savage MK, Ferrazzini V, Peltier A, Rivemale E, Mayor J, Schmid A, Brenguier F, Massin F, Got J-L, Battaglia J et al..  2015.  Seismic anisotropy and its precursory change before eruptions at Piton de la Fournaise volcano, La Reunion. Journal of Geophysical Research: Solid Earth. 120(5):3430-3458.