The role of NMR imaging in the assessment of multiple sclerosis and isolated neurological lesions. A quantitative study. - Ormerod,I.E.; Miller,D.H.; McDonald,W.I.; Boulay,E.P du.; Rudge,P.; Kendall,B.E.; Moseley,I.F.; Johnson,G.; Tofts,P.S.; Halliday,A.M. (Brain, 1987)