Search for the η-mesic Helium bound state with the WASA-at-COSY facility Magdalena Skurzok, Wojciech Krzemień, Oleksandr Rundel and Pawel Moskal EPJ Web of Conferences, 117 (2016) 02005 Published online: 11 May 2016 DOI: 10.1051/epjconf/201611702005