Brody JA, Hussels I, Brink E, Torres J (1970). "Hereditary blindness among Pingelapese people of Eastern Caroline Islands". Lancet. 1 (7659): 1253–7. doi:10.1016/S0140-6736(70)91740-X. PMID4192495.
Brody JA, Hussels I, Brink E, Torres J (1970). "Hereditary blindness among Pingelapese people of Eastern Caroline Islands". Lancet. 1 (7659): 1253–7. doi:10.1016/S0140-6736(70)91740-X. PMID4192495.