Title: Spectral and morphological study of the gamma radiation of the middle-aged supernova remnant HB 21
Authors: Ambrogi, L.; Zanin, R.; Casanova, S.; De Oña Wilhelmi, E.; Peron, G.; Aharonian, F.
Journal: Astronomy and Astrophysics
Publication type: article
DOI: 10.1051/0004-6361/201833985