diff --git a/src/Dets/H_apply_template.f b/src/Dets/H_apply_template.f
index 73059635..b3984448 100644
--- a/src/Dets/H_apply_template.f
+++ b/src/Dets/H_apply_template.f
@@ -447,8 +447,8 @@ subroutine $subroutine($params_main)
   !$OMP END PARALLEL
   !$ call omp_destroy_lock(lck)
 
+  allocate( mask(N_int,2,6) )
 !  do i_generator=1,N_det_generators
-
   do i_generator=nmax+1,N_det_generators
 
 
diff --git a/src/Dets/connected_to_ref.irp.f b/src/Dets/connected_to_ref.irp.f
index 6d7dcab1..2f01a8e0 100644
--- a/src/Dets/connected_to_ref.irp.f
+++ b/src/Dets/connected_to_ref.irp.f
@@ -1,3 +1,18 @@
+integer*8 function det_search_key(det,Nint)
+  use bitmasks
+  implicit none
+  BEGIN_DOC
+! Return an integer*8 corresponding to a determinant index for searching
+  END_DOC
+  integer, intent(in) :: Nint
+  integer(bit_kind), intent(in) :: det(Nint,2)
+  integer :: i
+  det_search_key = iand(det(1,1),det(1,2))
+  do i=2,Nint
+    det_search_key = ieor(det_search_key,iand(det(i,1),det(i,2)))
+  enddo
+end
+
 logical function is_in_wavefunction(key,Nint,Ndet)
   implicit none
 
@@ -12,12 +27,15 @@ logical function is_in_wavefunction(key,Nint,Ndet)
   ibegin = 1
   iend   = N_det+1
   
+  !DIR$ FORCEINLINE
   det_ref = det_search_key(key,Nint)
+  !DIR$ FORCEINLINE
   det_search = det_search_key(psi_det_sorted_bit(1,1,1),Nint)
   
   istep = ishft(iend-ibegin,-1)
   i=ibegin+istep
   do while (istep > 0)
+    !DIR$ FORCEINLINE
     det_search = det_search_key(psi_det_sorted_bit(1,1,i),Nint)
     if ( det_search > det_ref ) then
       iend = i
@@ -30,6 +48,7 @@ logical function is_in_wavefunction(key,Nint,Ndet)
     i = ibegin + istep 
   end do
 
+  !DIR$ FORCEINLINE
   do while (det_search_key(psi_det_sorted_bit(1,1,i),Nint) == det_ref)
     i = i-1
     if (i == 0) then
@@ -41,6 +60,7 @@ logical function is_in_wavefunction(key,Nint,Ndet)
     return
   endif
 
+  !DIR$ FORCEINLINE
   do while (det_search_key(psi_det_sorted_bit(1,1,i),Nint) == det_ref)
     if ( (key(1,1) /= psi_det_sorted_bit(1,1,i)).or.                               &
           (key(1,2) /= psi_det_sorted_bit(1,2,i)) ) then
@@ -116,7 +136,7 @@ integer function connected_to_ref(key,keys,Nint,N_past_in,Ndet)
   N_past = max(1,N_past_in)
   if (Nint == 1) then
     
-    do i=1,N_past-1
+    do i=N_past-1,1,-1
       degree_x2 = popcnt(xor( key(1,1), keys(1,1,i))) +              &
           popcnt(xor( key(1,2), keys(1,2,i)))
       if (degree_x2 > 4) then
@@ -132,7 +152,7 @@ integer function connected_to_ref(key,keys,Nint,N_past_in,Ndet)
     
   else if (Nint==2) then
     
-    do i=1,N_past-1
+    do i=N_past-1,1,-1
       degree_x2 = popcnt(xor( key(1,1), keys(1,1,i))) +              &
           popcnt(xor( key(1,2), keys(1,2,i))) +                      &
           popcnt(xor( key(2,1), keys(2,1,i))) +                      &
@@ -149,7 +169,7 @@ integer function connected_to_ref(key,keys,Nint,N_past_in,Ndet)
     
   else if (Nint==3) then
     
-    do i=1,N_past-1
+    do i=N_past-1,1,-1
       degree_x2 = popcnt(xor( key(1,1), keys(1,1,i))) +              &
           popcnt(xor( key(1,2), keys(1,2,i))) +                      &
           popcnt(xor( key(2,1), keys(2,1,i))) +                      &
@@ -168,7 +188,7 @@ integer function connected_to_ref(key,keys,Nint,N_past_in,Ndet)
     
   else
     
-    do i=1,N_past-1
+    do i=N_past-1,1,-1
       degree_x2 = popcnt(xor( key(1,1), keys(1,1,i))) +              &
           popcnt(xor( key(1,2), keys(1,2,i)))
       !DEC$ LOOP COUNT MIN(3)
diff --git a/src/Dets/determinants.irp.f b/src/Dets/determinants.irp.f
index 913b6a7d..f7ec2dfc 100644
--- a/src/Dets/determinants.irp.f
+++ b/src/Dets/determinants.irp.f
@@ -292,21 +292,6 @@ END_PROVIDER
 END_PROVIDER
 
 
-integer*8 function det_search_key(det,Nint)
-  use bitmasks
-  implicit none
-  BEGIN_DOC
-! Return an integer*8 corresponding to a determinant index for searching
-  END_DOC
-  integer, intent(in) :: Nint
-  integer(bit_kind), intent(in) :: det(Nint,2)
-  integer :: i
-  det_search_key = iand(det(1,1),det(1,2))
-  do i=2,Nint
-    det_search_key = ieor(det_search_key,iand(det(i,1),det(i,2)))
-  enddo
-end
-
 subroutine save_wavefunction
   implicit none
   use bitmasks
diff --git a/src/Full_CI/README.rst b/src/Full_CI/README.rst
index f63f5a06..38b30dea 100644
--- a/src/Full_CI/README.rst
+++ b/src/Full_CI/README.rst
@@ -10,6 +10,9 @@ Documentation
 .. Do not edit this section. It was auto-generated from the
 .. NEEDED_MODULES file.
 
+`full_ci <http://github.com/LCPQ/quantum_package/tree/master/src/Full_CI/full_ci.irp.f#L1>`_
+  Undocumented
+
 
 
 Needed Modules
diff --git a/src/Full_CI/full_ci.irp.f b/src/Full_CI/full_ci.irp.f
index 51c20b87..a389e616 100644
--- a/src/Full_CI/full_ci.irp.f
+++ b/src/Full_CI/full_ci.irp.f
@@ -1,4 +1,4 @@
-program cisd
+program full_ci
   implicit none
   integer                        :: i,k
 
diff --git a/src/Perturbation/perturbation_template.f b/src/Perturbation/perturbation_template.f
index ac9c018d..a450edff 100644
--- a/src/Perturbation/perturbation_template.f
+++ b/src/Perturbation/perturbation_template.f
@@ -25,15 +25,16 @@ subroutine perturb_buffer_$PERT(i_generator,buffer,buffer_size,e_2_pert_buffer,c
   ASSERT (N_st > 0)
   do i = 1,buffer_size
 
-    if (is_in_wavefunction(buffer(1,1,i),Nint,N_det)) then
-      cycle
-    endif
     c_ref = connected_to_ref(buffer(1,1,i),psi_generators,Nint,i_generator,N_det)
 
     if (c_ref /= 0) then
       cycle
     endif
     
+    if (is_in_wavefunction(buffer(1,1,i),Nint,N_det)) then
+      cycle
+    endif
+
     call pt2_$PERT(buffer(1,1,i),         &
         c_pert,e_2_pert,H_pert_diag,Nint,N_det_selectors,n_st)