1. Usher's syndrome: electrophysiological tests of the visual and auditory systems;Abraham, F.A.; Cohen, D.; Sohmer, H.;Documenta,1977
2. The Usher syndrome: clinical definition;Bergsma, D.R.,1976
3. Foveal lesions seen in retinitis pigmentosa;Fishman, G.A.; Maggiano, J.; Fishman, M.;Archives of Ophthalmology, 95,1977
4. Retinitis pigmentosa combined with congenital deafness; with vestibulo-cerebellar ataxia and mental abnormality in a proportion of cases: a clinical and genetics-statistical study;Hallgren, B.;Acta Psychiatrica Scandinavica,1959
5. Usher's and Hallgren's syndromes;Merin, S.; Abraham, F.A.; Auerbach, E.;Acta Geneticae Medicae et Gemellologiae,1974