Perez L. F., Prieto J. M., and Tutor J. C. “A Thermodynamic Study of β-N-Acetylhexosaminidase Enzyme Heterogeneity in Cerebrospinal Fluid from Patients With Multiple Sclerosis”. Upsala Journal of Medical Sciences, vol. 112, no. 3, July 2009, pp. 296–302, doi:10.3109/2000-1967-202.