Aharonian, F., Akhperjanian, A., Barres de Almeida, U., Bazer-Bachi, A., Behera, B., Beilicke, M., …Zech, A. (2008). HESS very-high-energy gamma-ray sources without identified counterparts. Astronomy and Astrophysics, 477(1), 353-363. https://doi.org/10.1051/0004-6361%3A20078516