1. I. M. Naboko, T. V. Barhenova, A. I. Opara, and V. A. Belavin, ?Formation of a jet of shock-heated gas outflowing into evacuated space,? Astronaut. Acta,17, 653?659 (1972).
2. V. A. Belavin, V. V. Golub, I. M. Naboko, and A. I. Opara, ?Investigation of nonsteady flow structure with outflow of shock-heated gas,? Zh. Prikl. Mekh. Tekh. Fiz., No. 5, 34?40 (1973).
3. V. P. Gusev, ?Triggering supersonic nozzles,? Inzh. Zh., No. 1 (1961).
4. G. A. Simons, ?The large time behavior of a steady spherical source expanding into an arbitrary ambient gas,? AIAA Paper, No. 70, 232 (1970).
5. S. F. Chekmarev, ?Nonsteady-state radial gas expansion into a flooded space from a suddenly switched on stationary source?, Zh. Prikl. Mekh. Tekh. Fiz., No. 2 (1975).