Mulligan, F.J. and Lubell, M.S. (1993) A hybrid beam design for slow positron transport. Measurement Science and Technology, 4. pp. 197-203.
Chan, N., Crowe, D.M., Lubell, M.S., Tang, F.C., Vasilakis, A., Mulligan, F.J. and Slevin, James A. (1988) A polarized atomic hydrogen beam. Zeitschrift fur Physik D, Atoms, Molecules and Clusters, 10. pp. 393-415.