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DOYMA, E. (2013). Journal of Optometry (October-Desember 2013, Vol. 6, n.4, page 212-218). Spanish: Elsevier Espana.

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DOYMA, Elsevier. "Journal of Optometry". October-Desember 2013, Vol. 6, n.4, page 212-218 Spanish: Elsevier Espana, 2013. Text.