1. Electron density decay in wakes.
2. I.P. French, R.A. Hayami, T.E. Arnold, 111. Steinberg, J.P.Appleton, and A.A. Sonin, "Calibration and Use of Electrostatic Probes for Hypersonic Wake Diagnostics, ''ICIASF Conf Proc May 1969, p34, submitted toAUA 9.