Griffiths, R., della Ceca, R., Georgantopoulos, I., Boyle, B., Stewart, G., Shanks, T., & Fruscione, A. (1996). A Deep ROSAT Survey - X. X-ray-luminous narrow-emission-line galaxies. Monthly Notices of the Royal Astronomical Society, 281, 71-83. https://doi.org/10.1093/mnras/281.1.71