S. P. Gautam, A. Silwal, and A. K. Jha, “Dust Color Temperature and Planck Function Distribution of a Far Infrared Planetary Nebula at 90 and 140 μm AKARI Map”, Int. Astron. Astrophys. Res. J., vol. 2, no. 1, pp. 75–82, Jul. 2020.