Lebourg, E., Lints, FA., & Lints, CV. (1984). Does a Relationship Exist Between Spontaneous Locomotor-activity, Fitness and Lifespan in Drosophila-melanogaster. Experimental Gerontology, 19(3), 205-210. https://doi.org/10.1016/0531-5565(84)90040-8 (Original work published 1984)