1. A type of advanced mud-hammer applied to oil drilling;Jian,2005
2. Research on large impact energy hydro - hammer and its application;Yin;Explor. Eng. (Drill. Tunnel.),1996
3. Overcoming hard rock drilling challenges;Santos,2000
4. Fluid hammer drives down well costs;Staysko,2011
5. Hammer drilling technology-the proved solution to drill hard rock formations in the middle east;Vieira,2011