%0 Journal Article %A Gant P. %A Ghasemi F. %A Maeso D. %A Munuera C. %A López-Elvira E. %A Frisenda R. %A De Lara D.P. %A Rubio-Bollinger G. %A Garcia-Hernandez M. %A Castellanos-Gomez A. %T Optical contrast and refractive index of natural van der Waals heterostructure nanosheets of franckeite %D 2017 %U http://hdl.handle.net/20.500.12614/1425 %~