Fabian, A. C., Zoghbi, A., Ross, R. R., Uttley, P., Gallo, L. C., Brandt, W. N., Blustin, A. J., Boller, T., Cadallero-Garcia, M. D., Larsson, J., Miller, J. M., Miniutti, G., Ponti, G., Reis, R. C., Reynolds, C. S., Tanaka, Y., & Young, A. J. (2009). Broad line emission from iron K- and L-shell transitions in the active galaxy 1H 0707-495. Nature, 459(7246), 540-542. doi:10.1038/nature08007.