Prestwich, A., Galache, J., Linden, T., Kalogera, V., Zezas, A., Roberts, T., …Trinchieri, G. (2012). Chandra observations of the collisional ring galaxy NGC 922. Astrophysical Journal, 747(2), Article 150. https://doi.org/10.1088/0004-637x/747/2/150