1. Clinical study of primary progressive multiple sclerosis in Northern Ireland;McDonnell;J. Neurol., Neurosurg. Psychiatry,1998
2. Defining the clinical course of multiple sclerosis: results of an international survey;Lublin;Neurology,1996
3. Histologie de la sclérose en plaques;Charcot;Gaz. Hôp.,1868
4. Some aspects of the natural history of disseminated sclerosis;McAlpine;Q. J. Med.,1952
5. Low-dose (7.5 mg) oral methotrexate reduces the rate of progression in chronic progressive multiple sclerosis;Goodkin;Ann. Neurol.,1995