1. Bao-Hong, S., Jian-Zhong, L., Hong, Z.: The technical measures of gas control in china coal mines. J. China Coal Soc. 32(7), 673–679 (2007)
2. Zhao-feng, W.A.N.G., Fu-chao, T.I.A.N., Bin, Z.H.A.O., Xiang-jun, C.H.E.N., Bao-zhong, Y.U.: The testing of gas drainage efficiency about feather-veined 1000 m length-drill hole. J. China Coal Soc. 35(1), 76–79 (2010)
3. Lin, B.Q., Li, Q.Z., Yang, W., Wu, H.J., Hao, Z.: Gas control technology and applications for the three-soft coal seam based on VLD-1000 drilling systems. J. China Coal Soc. 36(12), 1968–1973 (2011)
4. Xie, S.R., Zhao, Y.J., Zhang, S.B., Yang, H.Z., Xiao, D.C., Tian, C.Y.: Mechanism and experiment of substituting high drainage roadway with directional long drilling group to extract pressure-relief gas. J. Central South Univ. 19(9), 2591–2597 (2012)
5. Lubinski, A., Woods, H.B.: Factors affecting the angle of inclination and dog-legging in rotary bore holes. Drilling Prod. Pract. 1953, 222–250 (1953)