Periodic negative magnetoresistance in granular YBa2Cu3O7−δ nanowiresD. Levi, A. Shaulov, A. Frydman, G. Koren, B. Ya. Shapiro and Y. YeshurunEPL, 101 6 (2013) 67005DOI: https://doi.org/10.1209/0295-5075/101/67005