1. Dislocations in the diamond lattice
2. This theory is the same as that used to explain abrupt yielding in iron and steel. For recent developments leading a.o. to formula (1), see Cottrell , A.H., Transact. Metall. Soc. AIME, 212 (1958) 646.
3. Dislocations and plastic flow of crystals;Cottrell,1953