1. K. C. Kao and W. Hwang ,Electrical Transport in Solids(Pergamon, Oxford, 1981).
2. N. F. Mott and R. W. Gurney ,Electronic Processes in Ionic Crystals(Oxford University Press, New York, 1940).
3. M. A. Lampert and P. Mark ,Current Injection in Solids(Academic, New York, 1970).
4. M. Pope and C. E. Swenberg ,Electronic Processes in Organic Crystals(Oxford University Press, Oxford, 1982).
5. Bulk limited conduction in electroluminescent polymer devices