References

• Acker A., Ochsenbein F., Stenholm B., Tylenda R., Marcout J., Schon C., 1992, Strasbourg-ESO Catalogue of Galactic Planetary Nebulae, European Southern Observatory
• Balick B., 1987, AJ 94, 671 NASA ADS
• Corradi R.L.M., Schwarz H.E., 1995, A&A 293, 871 NASA ADS
• Harpaz A., Soker N., 1994, Ann. Isr. Phys. Soc. 11, Asymmetrical Planetary Nebulae, Oranim, University of Haifa
• Manchado A., Guerrero M.A., Stanghellini L., Serra-Ricart M., 1996, The IAC Morphological Catalogue of Northern Galactic Planetary Nebulae, Instituto de Astrofísica de Canarias
• Schwarz H.E., Corradi R.L.M., Melnick J., 1992, A&AS 96, 23 NASA ADS
• Stanghellini L., Corradi R.L.M., Schwarz H.E., 1993, A&AS 279, 521