Near-threshold η-meson production in the dd↦He η reaction A. Wrońska, V. Hejny, C. Wilkin, S. Dymov, C. Hanhart, V. Komarov, H. R. Koch, A. Kulikov, A. Magiera, T. Mersmann et al. (6 more) Eur. Phys. J. A, 26 3 (2005) 421-428 Published online: 27 December 2005 DOI: 10.1140/epja/i2005-10185-0