W. A. Weidmann et R. Gamen, « Central stars of planetary nebulae. II. New OB-type and emission-line stars », Astronomy & Astrophysics, vol. 531, no A172, , p. 11 pages (DOI10.1051/0004-6361/201116494, lire en ligne [PDF])
M. Freeman, R. Montez Jr., J. H. Kastner et et al., « THE CHANDRA PLANETARY NEBULA SURVEY (ChanPlaNS). II. X-RAY EMISSION FROM COMPACT PLANETARY NEBULAE », The Astrophysical Journal, vol. 794, no 2, , p. 13 pages (DOI10.1088/0004-637X/794/2/99, lire en ligne [html])
Romano L. M. Corradi, Denise R. Gonçalves, Eva Villaver, Antonio Mampaso, Mario Perinotto, Hugo E. Schwarz et Caterina Zanin, « High-Velocity Collimated Outflows in Planetary Nebulae: NGC 6337, He 2-186, and K4-47 », The Astrophysical Journal, vol. 535, no 2, , p. 823-832 (DOI10.1086/308877, lire en ligne [PDF])
Todd C. Hillwig, Howard E. Bond, Melike Afşar et Orsola De Marco, « BINARY CENTRAL STARS OF PLANETARY NEBULAE DISCOVERED THROUGH PHOTOMETRIC VARIABILITY. II. MODELING THE CENTRAL STARS OF NGC 6026 AND NGC 6337 », The Astronomical Journal, vol. 140, no 2, , p. 319-327 (DOI10.1088/0004-6256/140/2/319, lire en ligne [PDF])
W. A. Weidmann et R. Gamen, « Central stars of planetary nebulae. II. New OB-type and emission-line stars », Astronomy & Astrophysics, vol. 531, no A172, , p. 11 pages (DOI10.1051/0004-6361/201116494, lire en ligne [PDF])
M. Freeman, R. Montez Jr., J. H. Kastner et et al., « THE CHANDRA PLANETARY NEBULA SURVEY (ChanPlaNS). II. X-RAY EMISSION FROM COMPACT PLANETARY NEBULAE », The Astrophysical Journal, vol. 794, no 2, , p. 13 pages (DOI10.1088/0004-637X/794/2/99, lire en ligne [html])
Romano L. M. Corradi, Denise R. Gonçalves, Eva Villaver, Antonio Mampaso, Mario Perinotto, Hugo E. Schwarz et Caterina Zanin, « High-Velocity Collimated Outflows in Planetary Nebulae: NGC 6337, He 2-186, and K4-47 », The Astrophysical Journal, vol. 535, no 2, , p. 823-832 (DOI10.1086/308877, lire en ligne [PDF])
Todd C. Hillwig, Howard E. Bond, Melike Afşar et Orsola De Marco, « BINARY CENTRAL STARS OF PLANETARY NEBULAE DISCOVERED THROUGH PHOTOMETRIC VARIABILITY. II. MODELING THE CENTRAL STARS OF NGC 6026 AND NGC 6337 », The Astronomical Journal, vol. 140, no 2, , p. 319-327 (DOI10.1088/0004-6256/140/2/319, lire en ligne [PDF])