Gauge invariance of DVCS off an arbitrary spin hadron: the deuteron target case I.V. Anikin, R.S. Pasechnik, B. Pire and O.V. Teryaev Eur. Phys. J. C, 72 7 (2012) 2055 Published online: 24 July 2012 DOI: 10.1140/epjc/s10052-012-2055-5