1. J. Heinzl and C. H. Hertz, Advances in Electronics and Electron Physics 65, 91 (1985).
2. M. B. Lyne, J. Imaging Technol. 12(2), 80 (1986).
3. D. L. Hammond, Hewlett-Packard J, March, p. 44 (1984).
4. Exxon, European Patent 181,198A (1984).
5. Howtek, European Patent 187,352A (1984)