Gofton, T. E. Canadian Journal of Neurological Sciences (2011)
Forsyth, P. A.; Weaver, S.; Fulton, D.; Brasher, P. M. A.; Sutherland, G.; Stewart, D.; Hagen, N. A.; Barnes, P.; Cairncross, J. G.; Deangelis, L. M. Canadian Journal of Neurological Sciences (2003)
Posner, J. B. Canadian Journal Neurological Sciences Inc (1993)