A High Resolution Investigation of the Anisotropic Electron-Positron Momentum Distribution in Diamond
R.W.N. Nilen, S.H. Connell, D.T. Britton, C.G. Fischer, E.J. Sendezera, W.G. Schmidt, J.P.F. Sellschop, W.S. Verwoerd, Materials Science Forum 255–257 (1997) 475–478.