The unusual supernova remnant G76.9+1.0: The low-frequency radio spectrum T. L. Landecker, Y. Zheng, X. Zhang and L. A. Higgs Astron. Astrophys. Suppl. Ser., 123 2 (1997) 199-207 Published online: 15 June 1997 DOI: 10.1051/aas:1997158