Scaringi, S., Körding, E., Groot, P., Uttley, P., Marsh, T., Knigge, C., Maccarone, T., & Dhillon, V. (2013). Discovery of Fourier-dependent time lags in cataclysmic variables. Monthly Notices of the Royal Astronomical Society, 431(3), https://doi.org/10.1093/mnras/stt347