1. Usher syndrome in four hard of hearing siblings;Davenport;Pediatrics,1978
2. Hearing loss in retinitis pigmentosa;Goode;Pediatrics,1967
3. Usher syndrome in four Norwegian counties;Grøndahl;Clin. Genet.,1986
4. Usher's syndrome, with special reference to heterozygous manifestations;Haas;Doc. Ophthalmol.,1970
5. Retinitis pigmentosa combined with congenital deafness; with vestibulocerebellar ataxia and mental abnormality in a proportion of cases: a clinical and geneticostatistical study;Hallgren;Acta Psychiatr. Neurol. Scand.,1959