Hönig, S. F., Kishimoto, M., Tristram, K. R. W., Prieto, M. A., Gandhi, P., Asmus, D., et al. (2013). Dust in the polar region as a major contributor to the infrared emission of active galactic nuclei. The Astrophysical Journal, 771(2): 87, pp. 1-14. doi:10.1088/0004-637X/771/2/87.