1. K. N. Trubetskoi (ed.), Mining Science, Development, and Conservation of the Earth's Bowels [in Russian] Academy of Mining Sciences, Moscow (1997).
2. A. A. Lipin, “USSR Patent No. 797650. Downhole pneumatic puncher.” Byull. Izobret., No. 7 (1993).
3. A. A. Lipin, and S. A. Zima, “Russian Federation Patent No. 2015324. Method of percussive-rotary drilling of boreholes and machine for its realization,” Byull. Izobret., No. 12 (1994).
4. A. A. Lipin and S. A. Zima, “Russian Federation Patent No. 2109124. Downhole percussive machine for ring-bottom borehole drilling,” Byull. Izobret., No. 11 (1998).