1. Analytical Control of Production in the Nitrogen Industry [in Russian], Goskhimizdat, Moscow, vol. 2, 1958.
2. Scientific and Technical Information from the State Institute of Applied Chemistry,1958
3. C. M. Steese and A. G. Whittaker, J. Chem. Phys.,24, 776, 1956.
4. J. W. Ellis, Phys. Rev.,38, 693, 1931.
5. J. A. Cursio and C. C. Petty, JOSA,41, no. 5, 1951.