Quireza, Cintia; Rood, Robert T.; Bania, T. M.; Balser, Dana S.; MacIel, Walter J. (2006). “The Electron Temperature Gradient in the Galactic Disk”. The Astrophysical Journal. 653 (2): 1226–1240. arXiv:astro-ph/0609006. Bibcode:2006ApJ...653.1226Q. doi:10.1086/508803.
Quireza, Cintia; Rood, Robert T.; Bania, T. M.; Balser, Dana S.; MacIel, Walter J. (2006). “The Electron Temperature Gradient in the Galactic Disk”. The Astrophysical Journal. 653 (2): 1226–1240. arXiv:astro-ph/0609006. Bibcode:2006ApJ...653.1226Q. doi:10.1086/508803.
Quireza, Cintia; Rood, Robert T.; Bania, T. M.; Balser, Dana S.; MacIel, Walter J. (2006). “The Electron Temperature Gradient in the Galactic Disk”. The Astrophysical Journal. 653 (2): 1226–1240. arXiv:astro-ph/0609006. Bibcode:2006ApJ...653.1226Q. doi:10.1086/508803.
nasa.gov
antwrp.gsfc.nasa.gov
Fernandez, Antonio (2008).
Sharpless 171, APOD, ngày 18 tháng 10 năm 2008
Gahm G. F., Carlqvist P., Johansson L. E. B., Nikolić S. (2008).
Rotating elephant trunks, Astronomy and Astrophysics, Volume 454, Issue 1, July IV 2006, pp.201-212