Armando Coco, Gilda Currenti, Ciro Del Negro and Giovanni Russo. (2014). A Second Order Finite-Difference Ghost-Point Method for Elasticity Problems on Unbounded Domains with Applications to Volcanology.
            <i>Communications in Computational Physics</i>. <i>16</i> (4).
            983-1009.
         doi:10.4208/cicp.210713.010414a