Fermi LAT Collaboration, 3C 279 Multiband Campaign, Abdo, A. A., Ackermann, M., Ajello, M., Axelsson, M., et al. (2010). A change in the optical polarization associated with a γ-ray flare in the blazar 3C 279. Nature, 463(7283), 919-923. doi:10.1038/nature08841.