diff --git a/triqs/gf/local/fourier_matsubara.cpp b/triqs/gf/local/fourier_matsubara.cpp
index 90447f60..eed9c309 100644
--- a/triqs/gf/local/fourier_matsubara.cpp
+++ b/triqs/gf/local/fourier_matsubara.cpp
@@ -44,7 +44,7 @@ namespace triqs { namespace gf {
   
   tqa::vector<dcomplex> g_in, g_out;
   
-  void direct ( gf_view<imfreq,scalar_valued> &gw , gf_view<imtime,scalar_valued> const& gt) {
+  void direct (gf_view<imfreq,scalar_valued> gw, gf_view<imtime,scalar_valued> const gt) {
    using namespace impl_local_matsubara;
    auto ta = gt(freq_infty());
    //TO BE MODIFIED AFTER SCALAR IMPLEMENTATION TODO
@@ -81,8 +81,6 @@ namespace triqs { namespace gf {
    gw.singularity() = gt.singularity();// set tail
   }
   
-  
-  
   void inverse(gf_view<imtime,scalar_valued> gt, gf_view<imfreq,scalar_valued> const gw){
    using namespace impl_local_matsubara;
    static bool Green_Function_Are_Complex_in_time = false;
diff --git a/triqs/gf/local/fourier_matsubara.hpp b/triqs/gf/local/fourier_matsubara.hpp
index fab132a4..bc8abc72 100644
--- a/triqs/gf/local/fourier_matsubara.hpp
+++ b/triqs/gf/local/fourier_matsubara.hpp
@@ -33,14 +33,14 @@ namespace triqs { namespace gf {
  void inverse_fourier_impl (gf_view<imtime,scalar_valued> gt,  gf_view<imfreq,scalar_valued> const gw, scalar_valued);
  void inverse_fourier_impl (gf_view<imtime,matrix_valued> gt,  gf_view<imfreq,matrix_valued> const gw, matrix_valued);
  
- inline gf_view<imfreq,matrix_valued> fourier (gf_view<imtime,matrix_valued> const & gt) {
+ inline gf_view<imfreq,matrix_valued> fourier (gf_view<imtime,matrix_valued> const gt) {
   size_t L = (gt.mesh().kind() == full_bins ? gt.mesh().size()-1 : gt.mesh().size() );
   auto gw = make_gf<imfreq,matrix_valued>(gt.domain().beta, gt.domain().statistic , gt.data().shape().front_pop(), L);
   auto V = gw();
   fourier_impl(V, gt, matrix_valued());
   return gw;
  }
- inline gf_view<imfreq,scalar_valued> fourier (gf_view<imtime,scalar_valued> const & gt) {
+ inline gf_view<imfreq,scalar_valued> fourier (gf_view<imtime,scalar_valued> const gt) {
   size_t L = (gt.mesh().kind() == full_bins ? gt.mesh().size()-1 : gt.mesh().size() );
   auto gw = make_gf<imfreq,scalar_valued>(gt.domain().beta, gt.domain().statistic, L);
   auto V = gw();
@@ -48,7 +48,7 @@ namespace triqs { namespace gf {
   return gw;
  }
  
- inline gf_view<imtime, matrix_valued> inverse_fourier (gf_view<imfreq, matrix_valued> const & gw, mesh_kind mk = half_bins) {
+ inline gf_view<imtime, matrix_valued> inverse_fourier (gf_view<imfreq, matrix_valued> const gw, mesh_kind mk = half_bins) {
   double pi = std::acos(-1);
   size_t L = (mk == full_bins ? gw.mesh().size()+1 : gw.mesh().size() );
   auto gt = make_gf<imtime,matrix_valued>(gw.domain().beta, gw.domain().statistic, gw.data().shape().front_pop(), L);
@@ -56,7 +56,7 @@ namespace triqs { namespace gf {
   inverse_fourier_impl(V, gw, matrix_valued());
   return gt;
  }
- inline gf_view<imtime,scalar_valued> inverse_fourier (gf_view<imfreq,scalar_valued> const & gw, mesh_kind mk = half_bins) {
+ inline gf_view<imtime,scalar_valued> inverse_fourier (gf_view<imfreq,scalar_valued> const gw, mesh_kind mk = half_bins) {
   double pi = std::acos(-1);
   size_t L = (mk == full_bins ? gw.mesh().size()+1 : gw.mesh().size() );
   auto gt = make_gf<imtime,scalar_valued>(gw.domain().beta, gw.domain().statistic, L);