<?xml version="1.0"?>
<response><item key="0"><nothing>R. R. Hartmann, N. J. Robinson, Mikhail Portnoi, "Smooth electron waveguides in graphene", Physical Review B, vol. 81, 2010, [DOI: 10.1103/physrevb.81.245431] [IF: 3.77, ]</nothing></item></response>
