New groups of planetary nebulae with peculiar dust chemistry towards the Galactic bulgeS. K. Górny, J. V. Perea-Calderón, D. A. García-Hernández, P. García-Lario and R. SzczerbaA&A, 516 (2010) A39DOI: https://doi.org/10.1051/0004-6361/200913010
