04. Nirmalan, P.K., S. Krishnaiah, B.R. Shamanna, et al., A population-based assessment of presbyopia in the state of Andhra Pradesh, south India: the Andhra Pradesh Eye Disease Study. Invest Ophthalmol Vis Sci, 2006. 47(6): p. 2324-8.

04. Nirmalan, P.K., S. Krishnaiah, B.R. Shamanna, et al., A population-based assessment of presbyopia in the state of Andhra Pradesh, south India: the Andhra Pradesh Eye Disease Study. Invest Ophthalmol Vis Sci, 2006. 47(6): p. 2324-8.