Acosta-Pulido, Jose A.; Vila-Vilaro, Baltasar; Perez-Fournon, Ismael; Wilson, Andrew S.; Tsvetanov, Zlatan I. (June 1996). "Toward an Understanding of the Seyfert Galaxy NGC 5252: A Spectroscopic Study". The Astrophysical Journal. 464: 177. Bibcode:1996ApJ...464..177A. doi:10.1086/177310.
Acosta-Pulido, Jose A.; Vila-Vilaro, Baltasar; Perez-Fournon, Ismael; Wilson, Andrew S.; Tsvetanov, Zlatan I. (June 1996). "Toward an Understanding of the Seyfert Galaxy NGC 5252: A Spectroscopic Study". The Astrophysical Journal. 464: 177. Bibcode:1996ApJ...464..177A. doi:10.1086/177310.