E. Gnapowski and  S. Gnapowski,  Impact Porous Dielectric Silica Gel for Operating Voltage and Power Discharge Reactor.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 86(2). 403 - 407
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/9997987.