Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). A new population of very high energy gamma-ray sources in the Milky Way. Science, 307(5717), 1938-1942. https://doi.org/10.1126/science.1108643