Read, SA; Collins, MJ; Carney, LG (janeiro de 2007). «A review of astigmatism and its possible genesis.». Clinical & experimental optometry. 90 (1): 5–19. PMID17177660. doi:10.1111/j.1444-0938.2007.00112.x
Read, SA; Collins, MJ; Carney, LG (janeiro de 2007). «A review of astigmatism and its possible genesis.». Clinical & experimental optometry. 90 (1): 5–19. PMID17177660. doi:10.1111/j.1444-0938.2007.00112.x