The Astrophysical Journal Supplement Series: 2017, vol: 231, issue: 2
1)- Masaaki Otsuka, Toshiya Ueta, Peter A M van Hoof, Raghvendra Sahai, Isabel Aleman, Albert A Zijlstra, You-Hua Chu, Eva Villaver, Marcelo L Leal-Ferreira, Joel Kastner, Ryszard Szczerba, Katrina M Exter. The Planetary Nebula Survey (HerPlaNS): A Comprehensive Dusty Photoionization Model of NGC6781.The Astrophysical journal. Supplement series. 2017, 231 (2):