Nebulosa de l'Ull de Gat (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nebulosa de l'Ull de Gat" in Catalan language version.

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Eva Gloria Villaver Sobrino «The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale» (en anglès). Astrophysical Journal, 1, 10-12-2008, pàg. 194–202. DOI: 10.1086/592395.

Reed, Darren S.; Balick, Bruce; Hajian, Arsen R.; Klayton, Tracy L.; Giovanardi, Stefano; Casertano, Stefano; Panagia, Nino; Terzian, Yervant (1999), "Hubble Space Telescope Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution", Astronomical Journal 118 (5): 2430–2441, doi:10.1086/301091

Reed, Darren S.; Balick, Bruce; Hajian, Arsen R.; Klayton, Tracy L.; Giovanardi, Stefano; Casertano, Stefano; Panagia, Nino; Terzian, Yervant (1999), "Hubble Space Telescope Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution", Astronomical Journal 118 (5): 2430–2441, doi:10.1086/301091

Agnès Acker «Weak emission line [WELS] central stars of planetary nebulae are [WC]-PG 1159 stars» (en anglès). Astronomy and Astrophysics, 1998, pàg. 9–12.
Eva Gloria Villaver Sobrino «The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale» (en anglès). Astrophysical Journal, 1, 10-12-2008, pàg. 194–202. DOI: 10.1086/592395.
«Gaia Data Release 2» (en anglès). VizieR Online Data Catalog, 25-04-2018, pàg. I/345.
«Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue». Astronomy and Astrophysics, 12-1995, pàg. 269–280.