Edelson, R., Alexander, T., Crenshaw, D., Kaspi, S., Malkan, M., Peterson, B., …Zou, Z. (1996). Multiwavelength Observations of Short-Timescale Variability in NGC 4151. IV. Analysis of Multiwavelength Continuum Variability. Astrophysical Journal, 470, 364-377. https://doi.org/10.1086/177872