. [charged] Etiology and clinical manifestations of vitamin B12 and folic acid deficiency - uptodate [1]
3. Anitha Sen et al;Ann Indian Acad Neurol 2013 Apr;16(2):255-8. Spinal MR Imaging in Vitamin B12 Deficiency: Case Series; Differential Diagnosis of Symmetrical Posterior Spinal Cord Lesions