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2. ***Ueber den spontanen Druckabfall bei Applanationstonometrie;Bechrakis;Ophthalmologica,1966
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4. CI-744 anesthesia for ophthalmological examination and surgery in monkeys;Kaufman;Invest. Ophthalmol,1975
5. Comparison of Mackay-Marg, Goldmann and Perkins Tonometers in abnormal corneas;McMillan;Arch. Ophthal,1975