Vallianatos, F;    Michas, G;    Benson, P;    Sammonds, P;      (2013)    Natural time analysis of critical phenomena: The case of acoustic emissions in triaxially deformed Etna basalt.                   Physica A: Statistical Mechanics and its Applications , 392  (20)   pp. 5172-5178.    10.1016/j.physa.2013.06.051 <https://doi.org/10.1016/j.physa.2013.06.051>.       Green open access