Production of N$\mathsf{_2}$ Radiative States in N$\mathsf{_2}$-H$\mathsf{_2}$ Flowing D.C. Discharge S.D. Popa, L. Hochard et A. Ricard J. Phys. III France, 7 6 (1997) 1331-1337 DOI: 10.1051/jp3:1997190