1. Kuzma, D. C. 1963a Trans. ASME, Ser. D,85,424.
2. Hughes, W. F. & Elco, R. A. 1962a J. Fluid Mech. 13,21.
3. Hughes, W. F. & Elco, R. A. 1962b Amer. Rocket Soc. J. 32,776.
4. Hughes, W. F. 1963 Trans. ASME, Ser. D,85,129.
5. Kuzma, D. C. 1963b ASME Pap. 63-Lub-3 (to be published).