1. Lida S, Kobaysahi A S, J. Basic Engg., D 91 (1969).
2. Erdogan F and Sih G C, J. Basic Engg., (1963) 519.
3. Sih G C, Int. J. Fracture, 10 (1974) 305.
4. Palaniswamy K and Knauss W G, Mechanics Today, (eds) S M Nasser, 4 (1978) 87.
5. Sutton M C, Deng X, Ma Jr F, Newman J C and James M, Int J. Struct. Solids, (2000) 591.