Abdo, A. A., Ackermann, M., Ajello, M., Axelsson, M., Baldini, L., Ballet, J., et al. (2009). Fermi/large area telescope discovery of gamma-ray emission from a relativistic jet in the Narrow-line quasar PMN J0948+0022. The Astrophysical Journal, 699(2), 976-984. doi:10.1088/0004-637X/699/2/976.