Pair production by γ-rays on electrons - Threshold for the momentum recoil detection M.L. Iparraguirre and G.O. Depaola Eur. Phys. J. C, 71 10 (2011) 1778 Published online: 26 October 2011 DOI: 10.1140/epjc/s10052-011-1778-z