ics of gaseous nebulae and active galactic nuclei, University Science Books, ISBN 978-1-891389-34-4 Parker, Quentin A.; Acker, A.; Frew, D. J.; Hartley, M.; Peyaud, A. E. J.; Ochsenbein, F.; Phillipps, S.; Russeil, D.; Beaulieu, S. F.; Cohen, M.; Köppen, J.; Miszalski, B.; Morgan, D. H.; Morris, R. A. H.; Pierce, M. J.; Vaughan, A. E. (November 2006), "The Macquarie/AAO/Strasbourg Hα Planetary Nebula Catalogue: MASH", Monthly Notices of the Royal Astronomical Society 373 (1):  79–94, doi:10.1111/j.1365-2966.2006.10950.x, Bibcode: 2006MNRAS.373...79P Parker, Quentin A.; Frew, David J.; Miszalski, B.; Kovacevic, Anna V.; Frinchaboy, Peter.; Dobbie, Paul D.; Köppen, J. (May 2011), "PHR 1315–6555: A bipolar planetary nebula in the compact Hyades-age open cluster ESO 96-SC04", Monthly Notices of the Royal Astronomical Society 413 (3):  1835–1844, doi:10.1111/j.1365-2966.2011.18259.x, Bibcode: 2011MNRAS.413.1835P Reed, Darren S.; Balick, Bruce; Hajian, Arsen R.; Klayton, Tracy L.; Giovana