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2. Clinical testing of light sense;Sloan;Arch. Ophth.,1940
3. Ueber die beeinflussung der kritischen Flimmer Frequenz durch verschieden weite Pupillen;Speiser;Ophthalmologica,1948
4. Lythgoe, R. J., and Tansley, K.: The adaptation of the eye: its relation to the critical fusion frequency. No. 134, Spec. Report Ser. Med. Res. Council, London, 1929.
5. The basis of clinical electroretinography;Karpe;Acta Ophth. Suppl.,1945