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Jay M. Enoch and Vasudevan Lakshminarayanan, «Duplication of Unique Optical Effects of Ancient Egyptian Lenses from the IV/V Dynasties: Lenses Fabricated ca. 2620–2400 B.C.E, or Roughly 4600 Years Ago», Ophthalmic and Physiological Optics 20, no. 2 (15 March 2000): 126 — 30.

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