References
- Proceedings of the Seventh International Congress of Photography. 1928. 52–173.
- The Photographic Researches of Ferdinand Hurler and Vero C. Driffield. R.P.S., London, 1920. 73.
- Ibid. 42–43.
- Jones, L. A., and Condil, H. R. J. Opt. Soc. America, 38, 147. Feb. 1948.
- Ibid. 38, 133.
- Ibid., 39, 125. Feb. 1949.
- Ibid. 39, 111.
- Ibid., 39, 95.
- Kingslake, R. Lenses in Photography. Cass. Hoyt. Corp., New York. 1951. 101–2.
- Jones, L. A. J. Franklin Institute, 227, 297, 497. 1939.
- Carr, L. H. A. J. Junior Inst. Eng., 59, 321. 1949.