Hamid Reza Pakzad,  Rarefactive and Compressive Solitary Waves in Warm Plasma with Positrons and Nonthermal Electrons.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2011, vol. 57(9). 1530 - 1534
    [viewed 25 January 2020]. Available from: https://publications.waset.org/pdf/6099.