Bertolini, A., N. Beverini, A. De Michele, F. Fidecaro, and F. Mango. “A Sapphire Monolithic Differential Accelerometer As Core Sensor for Gravity Gradiometric Geophysical Instrumentation”. Annals of Geophysics 49, no. 4-5 (December 25, 2006). Accessed September 27, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3111.