1. Erythrolabe in the normal eye;Baker;J. Physiol., Lond.,1963
2. The scotopic visibility function;Crawford,1949
3. Human visual purple;Crescitelli;Nature, Lond.,1953
4. Depolarization of retinal cones by light;Fuortes;J. Physiol. (Lond.),1973
5. The Florida Retinal Densitometer;Hood;J. Physiol., Lond.,1971