Lints, FA., & Bourgois, M. (1987). Phenotypic and Genotypic Differentiation in Cage Populations of Drosophila-melanogaster .1. Duration of Development, Thorax Size and Weight. Genetics Selection Evolution (Online), 19(2), 155-169. https://doi.org/10.1186/1297-9686-19-2-155 (Original work published 1987)