1. Rod-cone independence in the after-flash effect;Alpern;J. Physiol., Lond.,1965
2. The size of rod signals;Alpern;J. Physiol., Lond.,1970
3. La transmission des contrastes par le syste`me optique de l'oeil et les seuils de contrastes re´tiniens;Arnulf;C.R Acad. Sci., Paris,1960
4. Increment thresholds at low intensities considered as signal/noise discriminations;Barlow;J. Physiol., Lond.,1957
5. Adaptation to spatial stimuli;Blakemore;J. Physiol., Lond.,1968