  In this paper we prove, for small Hurst parameters, the higher order
differentiability of a stochastic flow associated with a stochastic
differential equation driven by an additive multi-dimensional fractional
Brownian noise, where the bounded variation part is given by the local time of
the unknown solution process. The proof of this result relies on Fourier
analysis based variational calculus techniques and on intrinsic properties of
the fractional Brownian motion.
