Gautam, S. P., 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”. International Astronomy and Astrophysics Research Journal, Vol. 2, no. 2, July 2020, pp. 1-8, https://www.journaliaarj.com/index.php/IAARJ/article/view/16.