1. Rising mortality from motor neuron disease in the USA, 1962-1984;Lilienfeld, D.E.; Chan, E.; Ehland, J.;Lancet,1989
2. Increasing trend of ALS in France and elsewhere: are the changes real?;Durrelmann, S.; Alperovitch, A.;Neurology,1989
3. The mortality of motor neuron disease;in Sweden. Arch Neurol,1990
4. An introduction to epidemiology;Alderson, M.,1976
5. A crosssectional and cohort study of motor neurone disease in Piedmont, Italy;Chio, A.; Tribolo, A.; Oddenino, E.; Schiffer, D.,1991