1. W. Brandt A. Dupasquier (North Holland, Amsterdam, 1993).
2. R. Krause-Rehberg H. S. Leipner Positron Annihilation in Semiconductors (Springer, Berlin, 1971).
3. Interaction of positron beams with surfaces, thin films, and interfaces
4. A. Seeger F. Banhart W. Bauer in: Positron Annihilation, edited by L. Dorikens-Vanpraet (World Scientific, Singapore, 1989), p. 275.
5. Screening of positrons in semiconductors and insulators