1. C. D. Hendricks, Jr., “Charged Droplet Experiments“, Ramo-Wooldridge Research Laboratory Report No. RW-RL-158, September, 1959; American Rocket Society, Boston; 2nd Symposium on Advanced Propulsion Concepts, October, 1959.
2. “On the Equilibrium of Liquid Conducting Masses Charged with Electricity“;Rayleigh;Phil. Mag,1882
3. Staff of the Ramo-Wooldridge Research Laboratory, “Electrostatic Propulsion“, Proc. of the I.R.E., vol. 48, no. 4, pp. 477–491 (1960).