TY - Journal of Yangtze River Scientific Research Institute A1 - WANG Zhan-ke, GAO Hong-bo, HAN Xiao-yan, MA Peng T1 - Analytical Calculation Method for Unstable Toughness of Double-K Fracture Model Y1 - 2019-06-01 JF - Journal of Yangtze River Scientific Research Institute JO - Journal of Yangtze River Scientific Research Institute SP - 106 EP - 109 VL - 36 IS - 6 UR - http://ckyyb.crsri.cn N1 - 10.11988/ckyyb.20171144 ER -