Tekirian, T. ., Cole, G. ., Russell, M. ., Yang, F. ., Wekstein, D. ., Patel, E. ., … Geddes, J. . (1969). Carboxy terminal of beta-amyloid deposits in aged human, canine, and polar bear brains. Neurobiology of Aging, 17(2), 249-57. https://doi.org/10.1016/0197-4580(95)02062-4 (Original work published 1969)