Axial variation of electron number density in thermal plasma spray jetsN. K. Joshi, S. N. Sahasrabudhe, K. P. Sreekumar and N. VenkatramaniEur. Phys. J. D, 26 2 (2003) 215-219DOI: https://doi.org/10.1140/epjd/e2003-00211-9