The high-acceptance dielectron spectrometer HADES The HADES Collaboration, G. Agakichiev, C. Agodi, H. Alvarez-Pol, E. Atkin, E. Badura, A. Balanda, A. Bassi, R. Bassini, G. Bellia et al. (206 more) Eur. Phys. J. A, 41 2 (2009) 243-277 Published online: 03 July 2009 DOI: 10.1140/epja/i2009-10807-5