NGC 6629 - Corradi, Schonberner, Steffen & Perinotto (2003 MNRAS 340, 417) (Halpha, [OIII], [NII])
NGC 6629 - Schwarz, H.E., Corradi, R.L.M., Melnick, J 1992 A&A Suppl, 96, 23 (Halpha, [OIII], [NII])