Transport measurements on ultra-clean dual-gated suspended bilayer graphene J. Velasco Jr., L. Jing, Y. Lee, P. Kratz, W. Bao, D. Smirnov, M. Bockrath and C. N. Lau EPJ Web of Conferences, 23 (2012) 00018 Published online: 07 March 2012 DOI: 10.1051/epjconf/20122300018