1. Electrical Coronas, Their Basic Physical Mechanism;Loeb,1965
2. Analysis of the effect of humidity on dc corona power loss;Khalifa,1971
3. Study of the electric fields required for streamer propagation in humid air;Allen,1991
4. Positive dc corona and sparkover in short and long rod-plane gaps under variable humidity conditions;Boutledj,1991
5. Positive corona discharge in three electrode system;Salam;Journal of Electrostatics,1989