1. Nonuniform propagation of imploding shocks and detonations.
2. Initial propagation of impulsively generated converging cylindrical and spherical shock waves
3. Ya. B. Zel’dovich and Yu. P. Raizer,Physics of Shock Waves and High-Temperature Hydrodynamic Phenomena(Academic, New York, 1967), Vol. II, Chap. XII, p. 785.