Larsen, K. A., Rescigno, T. N., Streeter, Z. L., Iskandar, W., Heck, S., Gatton, A., Champenois, E. G., Severt, T., Strom, R., Jochim, B., Reedy, D., Call, D., Moshammer, R., Dörner, R., Landers, A. L., Williams, J. B., McCurdy, C. W., Lucchese, R. R., Ben-Itzhak, I., Slaughter, D. S., & Weber, T. (n.d.). mechanisms and dynamics of the NH+2 + H+ and NH+ + H+ + H fragmentation channels upon single-photon double ionization of NH3. Journal of physics, 53, . http://access.bl.uk/ark:/81055/vdc_100116172822.0x00005e