1. 作者：D. H. Chen.
    标题： A crack normal to and termination at a biomaterial.
    来源：Eng. Fracture Mech. 1994(4):517-532

2.作者：J. H. Chang, D. J. Wu.
   标题：Calculation of Mixed-mode Stress Intensity Faetors for a Craek Normal to a Bimaterial Interface Using Contour Integrals.
   来源：Engineering Fracture Mechanics. 2003.70:1675-1695

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