2. https://www.nist.gov/pml/atomic-spectra-database.

3. M.A. Lieberman and A.J. Lichtenberg, Principles of Plasma Discharges and Materials Processing, John Wiley & Sons, 2005.

4. G.J.M. Hagelaar and L.C. Pitchford, “Solving the Boltzmann equation to obtain electron transport coefficients and rate coefficients for fluid models”, Plasma Sources Science and Technology, vol. 14, pp. 722–733, 2005.