The supernova remnants G 67.7+1.8, G 31.5-0.6 and G 49.2-0.7 F. Mavromatakis, J. Papamastorakis, J. Ventura, W. Becker, E. V. Paleologou and D. Schaudel A&A, 370 1 (2001) 265-272 Published online: 15 April 2001 DOI: 10.1051/0004-6361:20010137