Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). Discovery of very high energy gamma rays associated with an x-ray binary. Science, 309(5735), 746-749. https://doi.org/10.1126/science.1113764