Deep optical observations of the supernova remnants G 126.2+1.6, G 59.8+1.2 and G 54.4-0.3 P. Boumis, F. Mavromatakis, E. M. Xilouris, J. Alikakos, M. P. Redman and C. D. Goudis A&A, 443 1 (2005) 175-183 Published online: 21 October 2005 DOI: 10.1051/0004-6361:20053484