Pisma v Zhurnal Tekhnicheskoi Fiziki, 1986 Volume 12, Issue 19,Pages 1186–1190(Mi pjtf279)
Definition of atomic oxygen concentration in the UHF pulse discharge in the air, relatively to intensities of $O(3p^3\,P-3s^3\,S)$ line and
$N_2(C^3\Pi_{u}v=0-B^3\Pi\sum\limits_{i}v_{i})$ band