Rulon, L., Robertson, J., Lovell, M., Deibel, M., Ehmann, W., & Markesber, W. (1969). Serum zinc levels and Alzheimer’s disease. Biological Trace Element Research, 75(1-3), 79-85. https://doi.org/10.1385/bter:75:1-3:79 (Original work published 1969)