A. O. Nusbaum, D. Lu, C.Y. Tang, and S. W. Altas. Quantitative Diffusion Measurements in Focal Multiple Sclerosis Lesions: Correlations with Appearance on T1-Weighted Images. Am. J. Roentgenol, 175:821-825, 2000. (bibtex: Nusbaum-2000-QDM).