Linnen, C., Poh, Y., Peterson, B., Barrett, R., Larson, J., Jensen, J., & Hoekstra, H. (2013). Adaptive evolution of multiple traits through multiple mutations at a single gene. Science (New York, N.Y.), 339(6125), 1312-6. https://doi.org/10.1126/science.1233213 (Original work published 2013)