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2. Preliminary investigation into the cracking of polyurethane;Theiss,1978
3. Variability in crack growth in a composite material;Liu;AIAA Paper 83-1015,1983
4. Crack growth behavior in a composite propellant with strain gradients;Liu;AIAA Paper 85-0615,1985
5. Crack growth behavior in a composite propellant with strain gradients — Part II;Liu;Journal of Spacecraft and Rockets,1990