πN TDAs from charmonium production in association with a forward pion at P̅ANDA B. Ma, B. Pire, K. Semenov-Tian-Shansky and L. Szymanowski EPJ Web of Conferences, 73 (2014) 05006 Published online: 09 June 2014 DOI: 10.1051/epjconf/20147305006