Andreev tunneling in charge pumping with SINIS turnstiles T. Aref, V. F. Maisi, M. V. Gustafsson, P. Delsing and J. P. Pekola EPL, 96 3 (2011) 37008 Published online: 13 October 2011 DOI: 10.1209/0295-5075/96/37008