Aouchiche, H. “Differential and Integral Cross Sections for Electron Elastic Scattering by Ammonia for Incident Energies Ranging from 10 EV to 20 KeV”. Revista Mexicana De Física, vol. 64, no. 5 Sept-Oct, Aug. 2018, pp. 498-06, doi:10.31349/RevMexFis.64.498.