1. THE INTERPRETATION OF SPECTRAL SENSITIVITY CURVES
2. 2. Dartnall, H. J. A. 1957. Paper No. 3. Symposium on Visual Problems of Colour. Natl. Phys. Lab. Teddington, Middlesex, England.
3. The visual pigments.
4. 4. Morton, R. A. & G. A. J. Pitt . 1957. Paper No. 2. Symposium on Visual Problems of Colour. Natl. Phys. Lab. Teddington, Middlesex, England.