1. Some Effects of Cavities on the Fracture of Ceramics: II, Spherical Cavities
2. 3G. I. Barenblatt, H. L. Dryden, Th. Karmann, and G. Kuerti ; pp.55 -126 inAdvances in Applied Mechanics , Vol. 7 . Academic Press, New York. 1962 .
3. 5R. J. Hartranfl, G. C. Sih, and G. C. Sih ; pp.179 -238 inMechanics of Fracture . Noordhoff, Leyden, The Netherlands, 1973 .