Costamente, L., Aharonian, F., Bühler, R., Khangulyan, D., Reimer, A., & Reimer, O. (2009). The new surprising behaviour of the two "prototype" blazars PKS 2155-304 and 3C 279. In Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy (pp. 644-647). Melville: AIP.