Properties of dust at the Galactic center probed by AKARI far-infrared spectral mapping - Detection of a dust featureH. Kaneda, A. Yasuda, T. Onaka, M. Kawada, N. Murakami, T. Nakagawa, Y. Okada and H. TakahashiA&A, 543 (2012) A79DOI: https://doi.org/10.1051/0004-6361/201219238