8CROSS J. Electrostatics : Principles, problems and applications[M]. Bristol, UK : Adam Hilger Ltd, 1957.
9TAYLOR D M, SECKER P E. Fundamentals and measurements[M]. Taunton, UK: Research Studies Press, 1994.
10KUMADA A, IWATA A, OZAKI K, et al. Kerr effect in gas and its application to noncontact measurement of electric field[J]. Journal of Applied Physics, 2002,92 (5) : 2875-2879.