1. Bube, R. H., Photoconductors ( Wiley, New York, 1960 ).
2. Keyes, R. J., and Kingston, R. H. ‘A Look at Photon Detectors’, Physics Today 25 (1972) 3.
3. Van Der Ziel, A. Solid State Physical Electronics ( Prentice-Hall, Englewood Cliffs, N.J., 1968 ).