1. G. Porter et al., unpublished results, private communication
2. C.J.M. Brugman, P.J. van Scherpenzeel, R.P.H. Rettschnick and G.J. Hoytink, to be published
3. C.J.M. Brugman, R.P.H. Rettschnick and G.J. Hoytink, to be published
4. Photoelectron Ejection from Aromatic Negative Ions in Rigid Media