1. B.A. Bilby, A.H. Cottrell and K.H. Swinden, Proceedings Royal Society London A272 (1963) 304–314.
2. M.Ya. Leonov and V.V. Panasyuk, Prokladraya Mechanika 5 (1959) 391–401.
3. D.S. Dugdale, Journal of the Mechanics and Physics of Solids 8 (1960) 100–104.
4. B.A. Bilby, A.H. Cottrell, E. Smith and K.H. Swinden, Proceedings Royal Society London A279 (1964) 1–9.
5. G.T. Hahn and A.R. Rosenfield, Acta Metallurgica 13 (1965) 293–306.