Voltage-driven quantum oscillations of conductance in graphene V. A. Yampol'skii, S. S. Apostolov, Z. A. Maizelis, A. Levchenko and F. Nori EPL, 96 6 (2011) 67009 Published online: 07 December 2011 DOI: 10.1209/0295-5075/96/67009