Abundances of Planetary Nebulae IC 418, IC 2165 and NGC 5882S. R. Pottasch, J. Bernard-Salas, D. A. Beintema and W. A. FeibelmanA&A, 423 2 (2004) 593-605DOI: https://doi.org/10.1051/0004-6361:20040413
