Alonso-Llanes, ...., Sánchez-Colina, ...., Martínez, ...., Batista-Leyva, ...., Toussaint, ...., & Altshuler, .... 2016 Nov 4. Intruder Penetration in Granular Matter Studied by Lock-In Accelerometry. Revista Cubana de Física. [Online] 33:2