1. W. Brandt and A. Dupasquier, eds., Positron Solid-State Physics, North-Holland, Amsterdam (1983).
2. P. Hautojärvi, ed., Positrons in Solids, Springer, Berlin (1979).
3. P.C. Jain, R.M. Singru, and K.P. Gopinathan, ces., Positron Annihilation, World Scientific, Singapore (1985).
4. L. Dorikens-Vanpraet, M. Dorikens, and D. Segers, eds., Positron Annihilation, World Scientific, Singapore (1989).
5. H. Ullmaier, Nuclear Fusion 24, 1039 (1984).