Influence of argon fraction on plasma parameters in H2-N2 mixture discharge with cathodic cageMuhammad Naeem, Mujahid Zaka-ul-Islam, Zahid Iqbal Khattak, Muhammad Shafiq and Muhammad ZakaullahEur. Phys. J. Appl. Phys., 77 1 (2017) 10801DOI: https://doi.org/10.1051/epjap/2016160280