The SDVL products was patented in 1999 Yan Gao
An analysis and study of drillstring axial vibration wave spectrum under drilling with tricone bit in 1998 Yan Gao
The SDVL technology was patented in 2007 Yan Gao
Calculation and Measurement of the Natural Frequency of Axial Drillingstring Vibration Yan Gao
AXIAL VIBRATION PERFORMANCE OF DRILL STRING WHEN DRILLING WITH THREE-CONE BIT in 2000 Yan Gao
