1. Prevalence of multiple sclerosis in north-east Scotland;Shepherd, D.I.; Downie, A.W.;Br Med J,1978
2. Census 1971 Scotland, Population Tables;(Scotland, General Register Office,1974
3. Census 1961 Scotland, County Reports;(Scotland, General Register Office,1963
4. Patient identification and documentation of causes of death in a follow-up register;Hedley, A.J.; Alexander, E.A.; Innes, G.;Health Bull (Edinb),1977
5. Medical Record Linkage: from the Oxford Record Linkage Study and the Unit of Clinical Epidemiology, Nuffield Department of Clinical Medicine, University of Oxford;Acheson, E.D.,1967