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Johnson, George Lindsay (1968). "Ophthalmoscopic Studies on the Eyes of Mammals". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 254 (794): 207–220. ISSN0080-4622. JSTOR2416833.
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Johnson, George Lindsay (1901). "Contributions to the Comparative Anatomy of the Mammalian Eye, Chiefly Based on Ophthalmoscopic Examination". Philosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character. 194: 1–82. ISSN0264-3960. JSTOR91868.
Johnson, George Lindsay (1927). "Contributions to the Comparative Anatomy of the Reptilian and the Amphibian Eye, Chiefly Based on Ophthalmological Examination". Philosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character. 215: 315–353. ISSN0264-3960. JSTOR92111.
Johnson, George Lindsay (1968). "Ophthalmoscopic Studies on the Eyes of Mammals". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 254 (794): 207–220. ISSN0080-4622. JSTOR2416833.