RESEARCH ON THE ENHANCED ACTIVE GAGE PROTECTION ROLLER CONE BITS
CHEN Zhi-hua ZHANG Fu-run YANG Chu-min
西南石油大学学报(自然科学版) . 2003, (4): 77 -77–80 .  DOI: 10.3863/j.issn.1000-2634.2003.04.22