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DOYMA, E. (2013). Journal of Optometry (April-June 2013, Vol. 6, n.2, page 75-79). Spanish: Elsevier Espana.

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DOYMA, Elsevier. "Journal of Optometry". April-June 2013, Vol. 6, n.2, page 75-79 Spanish: Elsevier Espana, 2013. Text.