Mixed aliphatic and aromatic composition of evaporating very small grains in NGC 7023 revealed by the 3.4/3.3 μm ratioP. Pilleri, C. Joblin, F. Boulanger and T. OnakaA&A, 577 (2015) A16DOI: https://doi.org/10.1051/0004-6361/201425590
