Near-IR spectroscopy of planetary nebulae precursors D. A. García-Hernández, A. Manchado, P. García-Lario, C. Domínguez-Tagle, G. M. Conway and F. Prada A&A, 387 3 (2002) 955-968 Published online: 17 May 2002 DOI: 10.1051/0004-6361:20020411