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Al-Haddad, C. E.; Mollayess, G. M. E. L.; Cherfan, C. G.; Jaafar, D. F.; Bashshur, Z. F. . (2011). Retinal nerve fibre layer and macular thickness in amblyopia as measured by spectral-domain optical coherence tomography. British Journal of Ophthalmology, 95(12), 1696–1699. doi:10.1136/bjo.2010.195081 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research