Low-excitation atomic gas around evolved stars - I. ISO observations of C-rich nebulae D. Fong, M. Meixner, A. Castro-Carrizo, V. Bujarrabal, W. B. Latter, A. G. G. M. Tielens, D. M. Kelly and E. C. Sutton A&A, 367 2 (2001) 652-673 Published online: 15 February 2001 DOI: 10.1051/0004-6361:20000434