1. Thresholds as dependent on some energy relations;Bartlett,1965
2. Principles of optics;Born,1970
3. A retinal acuity direction effect;Campbell;Journal of Physiology London,1958
4. Optical and retinal factors affecting visual resolution;Campbell;Journal of Physiology London,1965
5. The spatial resolving power of the human retina with oblique incidence;Campbell;Journal of the Optical Society of America,1960