References
- Tritton, F. J., and Wilson, E. T., Phot. J., 71, 396, 1939.
- Cartwrighl, H. M., Haigh. A., and Turner, E. L. Phot. J., 71, 266, 1931.
- Yule, J. A. C, and Nielsen. W. J., Mod. Lithography, 19, (9), 69, 1951.
- Gresham, D. C, Phot. J., 92B, 91, 1952. Sec Fig. 2, quadrant 4.
- Clapper, F. R., Proceedings of the Fifth Annual Technical Meeting of TAG A, Washington, D.C.. pp. 28-40, April 27-29, 1953.