Rotational relaxation of nitrogen in a free jet of argon - Belikov, A. E.; Dubrovskii, G. V.; Zarvin, A. E.; Karelov, N. V.; Pavlov, V. A.; Skovorodko, P. A.; Sharafutdinov, R. G. (Springer, 1986)
http://dx.doi.org/10.1007/BF00916132
Keywords: ZL; U