The Herschel Planetary Nebula Survey (HerPlaNS). I. Data overview and analysis demonstration with NGC 6781DOI: info:10.1051/0004-6361/201423395v. 565EDP Sciences36
Ueta, T., Ladjal, D., Exter, K. M., Otsuka, M., Szczerba, R., Siódmiak, N., Aleman, I., van Hoof, P. A. M., Kastner, J. H., Montez, Rodolfo, McDonald, I., Wittkowski, M., Sandin, C., Ramstedt, S., De Marco, O., Villaver, E., Chu, Y. -H, Vlemmings, W., Izumiura, H., Sahai, R., Lopez, J. A., Balick, B., Zijlstra, A., Tielens, A. G. G. M., Rattray, R. E. et al. 2014. "The Herschel Planetary Nebula Survey (HerPlaNS). I. Data overview and analysis demonstration with NGC 6781." Astronomy and Astrophysics, 565 36. https://doi.org/10.1051/0004-6361/201423395.