1. V. E. Makarov, ?Identification of discontinuity surfaces in the numerical calculation of supersonic conical flows,? Zh. Vychisl. Mat. Mat. Fiz.,22, 1218 (1932).
2. B. H. Bulakh, Nonlinear Conical Gas Flows [in Russian], Nauka, Moscow (1970).
3. M. D. Salas, ?Flow patterns near a conical sonic line,? AIAA J.,13, 227 (1980).
4. L. D. Landau and E. M. Lifshitz, Continuum Mechanics [in Russian], Gostekhizdat, Moscow (1953).
5. A. N. Kraiko and R. A. Tkalenko, ?Construction of a linear theory of nonequilibrium and equilibrium flows,? Izv. Akad. Nauk SSSR, Mekh. Zhidk. Gaza, No. 6, 26 (1968).