1. Hunter SC. The properties of spherically symmetric disturbances in ideally plastic materials. Proc. Conf. Properties of Materials at High Rates of Strain. London: Institute of Mechanical Engineers, 1957, p. 147.
2. Hopkins HG. Progress in solid mechanics. Amsterdam: North–Holland, 1964 [chapter III].
3. Spherical wave propagation in elastic–plastic work-hardening materials;Morland;J Mech Phys Solids,1969
4. The unloading problem for spherical elastic–plastic waves of small amplitude;Morland;J Mech Phys Solids,1970
5. The starting problem for spherical elastic–plastic waves of small amplitude;Chadwick;J Mech Phys Solids,1969