Komyshan, P. N., B. A. Okhrimenko, and K. S. Yablochkova. “Influence of a Deformation of NH3 Molecule on a Deviation of the Chemical Bond N–H”. Ukrainian Journal of Physics, vol. 59, no. 1, Oct. 2018, p. 9, doi:10.15407/ujpe59.01.0009.