1. R.H.Bube,Photoconductivity of Solids, Wiley and Sons, N.Y. (1960)
2. A.Rose,Concepts in Photoconductivity and Allied Problems, Wiley and Sons, N.Y. (1963)
3. R.G.Breckenridge, B.R.Russell and E.E.Hahn, Eds,Photo- conductivity Conference, Atlantic City 1954, Wiley and Sons, N.Y. (1956)
4. H.Levinstein, Ed,Photoconductivity, Pergamon, Oxford (1962)
5. E.M.Pell, Ed,Proceedings of the Third International Con- ference on Photoconductivity, Pergamon, Oxford (l97l)