J. Phys. B

Wight, G.R, van der Wiel, M.J, & Brion, C.E. (1977). Dipole oscillator strenghts for excitation, ionisation and fragmentation of NH3 in the 5 to 60 eV region. J. Phys. B: At., Mol. Opt. Phys., 10, 1863–1873.