CONTACT METHODS FOR DIAGNOSTICS OF THERMAL PLASMA P.Lj. STEFANOVIj, P.B. PAVLOVIj, M.M. JANKOVIj et S.N. OKA J. Phys. Colloques, 51 C5 (1990) C5-281-C5-288 DOI: 10.1051/jphyscol:1990534