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4. Sarcoidosis and its ophthalmic manifestations;Obenauf, C.D.; Shaw, H.E.; Sydnor, C.F.; Klintworth, G.K.;Am J Ophthalmol,1978
5. Limbal and corneal calcification in patients with chronic renal failure;Klaassen-Broekema, N.; van Bijstervald, O.P.;Br J Ophthalmol,1993