Nearby early-type galaxies with ionized gas - VI. The Spitzer-IRS view. Basic data set analysis and empirical spectral classificationP. Panuzzo, R. Rampazzo, A. Bressan, O. Vega, F. Annibali, L. M. Buson, M. S. Clemens and W. W. ZeilingerA&A, 528 (2011) A10DOI: https://doi.org/10.1051/0004-6361/201015908
