NITRIDE AND CARBIDE COATINGS SYNTHESIS ON THE SURFACE OF REFRACTORY METALS BY LASER ACTION A.A. UGLOV, M.B. IGNAT'EV, A.G. GNEDOVETS and I.YU. SMUROV J. Phys. Colloques, 50 C5 (1989) C5-727-C5-733 DOI: 10.1051/jphyscol:1989586