Ficarella, A., A. Giuffrida, and D. Laforgia. “NUMERICAL INVESTIGATIONS ON THE WORKING CYCLE OF A HYDRAULIC BREAKER: OFF-DESIGN PERFORMANCE AND INFLUENCE OF DESIGN PARAMETERS”. International Journal of Fluid Power, vol. 7, no. 3, Nov. 2006, pp. 41-50, https://journals.riverpublishers.com/index.php/IJFP/article/view/552.