1. M.T.C. Fang and W.H. Bu: IEE Proc-A, Vol. 138, No. 1 (1991), p.71.
2. S. Taylor, M.T.C. Fang and D.W. Shimmin: IEE Proc-A, Vol. 138, No. 5 (1991), p.259.
3. R. Meier, F. K. Kneubühl, and H. J. Schötzau: Appl. Phys. B 48 (1989), p.187.
4. L. Müller: 11 th Inter. Con. on Gas Discharges and Their Applications (1995), p.366.
5. A.K. Pugachev, V.S. Chemeris, A.F. Tikhomirov and O.I. Ol'shevskii: Elektrotekhnika, Vol. 61, No. 12 (1990), p.72.