QUENCHING OF n = 3, 4 SINGLET HeI EXCITED STATES BY MOLECULAR NITROGEN IN A LOW-PRESSURE GLOW DISCHARGE A. Catherinot and B. Dubreuil. J. Phys. Colloques, 40 C7 (1979) C7-85-C7-86 DOI: 10.1051/jphyscol:1979742