  We discuss the contribution of edge scattering to the conductance of graphene
nanoribbons and nanoflakes. Using different possible types of the boundary
conditions for the electron wave function at the edge, we found dependences of
the momentum relaxation time and conductance on the geometric sizes and on the
carrier density. We also consider the case of ballistic nanoribbon and
nanodisc, for which the edge scaterring is the main mechanism of momentum
relaxation.
