1. G. Bekefi, Radiation Processes in Plasmas, Wiley, New York, 1966
2. E. Beyer, K. Behler, U. Petschke, and W. Sokolowski, Schweißen mit CO2-Lasern, Laser und Optoelektronik, Vol. 18, pp. 35–46, 1986
3. P. Cavaliere, G. Ferrante, and C. Leone, Particle-atom ionising collisions in the presence of a laser radiation field, J. Phys. B, Vol. 13, p. 4495, 1980
4. H.W. Drawin and P. Felenbok, Data for Plasmas in Local Thermodynamic Equilibrium, Gauthier-Villars, Paris, 1965
5. W. Ebeling, W.D. Kraeft, and D. Kremp, Theory of Bound States and Ionization Equilibrium in Plasmas and Solids, Akademie-Verlag, Berlin, 1976