Shimizu, T. Taro Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Ichikawa, K., Ricci, C., Ueda, Y., Bauer, F. E., Kawamuro, T., Koss, M. J., et al. (2019). BAT AGN spectroscopic survey. XI. The covering factor of dust and gas in Swift/BAT active galactic nuclei. The Astrophysical Journal, 870(1): 31, pp. 1-16. doi:10.3847/1538-4357/aaef8f.