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Comparison of surface roughness for graphene on SiO 2 and on mica, and for cleaved graphite. CH Lui et al . Nature 462 , 339 - 341 (2009) doi:10.1038/nature08 569.
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Comparison of surface roughness for graphene on SiO2 and on mica, and for cleaved graphite. CH Lui et al. Nature462, 339-341 (2009) doi:10.1038/nature08569