30.Kleinstein, R. N., Jones, L. A., Hullett, S., Kwon, S., Lee, R. J., Friedman, N. E., Manny, R. E., Mutti, D. O., Yu, J. A., and Zadnik, K. (2003) Refractive error and ethnicity in children. Arch Ophthalmol 121, 1141-1147

30.Kleinstein, R. N., Jones, L. A., Hullett, S., Kwon, S., Lee, R. J., Friedman, N. E., Manny, R. E., Mutti, D. O., Yu, J. A., and Zadnik, K. (2003) Refractive error and ethnicity in children. Arch Ophthalmol 121, 1141-1147