%0 Journal %J Electron Device Letters, IEEE %D 2011 %T Negative Differential Resistance In Mono And Bilayer Graphene Pn Junctions %A Fiori, Gianluca %I IEEE %N 10 %P 1334-1336 %U http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5999697 %V 32 %@ 0741-3106 %1 10.1109/LED.2011.2162392