diff --git a/src/GW/GW_ppBSE_dynamic_kernel_C.f90 b/src/GW/GW_ppBSE_dynamic_kernel_C.f90
new file mode 100644
index 0000000..23f4fe0
--- /dev/null
+++ b/src/GW/GW_ppBSE_dynamic_kernel_C.f90
@@ -0,0 +1,139 @@
+subroutine GW_ppBSE_dynamic_kernel_C(ispin,eta,nBas,nC,nO,nV,nR,nS,nVV,lambda,eGW,Om,rho,OmBSE,KC_dyn,ZC_dyn)
+
+! Compute the dynamic part of the Bethe-Salpeter equation matrices
+
+  implicit none
+  include 'parameters.h'
+
+! Input variables
+
+  integer,intent(in)            :: ispin
+  integer,intent(in)            :: nBas
+  integer,intent(in)            :: nC
+  integer,intent(in)            :: nO
+  integer,intent(in)            :: nV
+  integer,intent(in)            :: nR
+  integer,intent(in)            :: nS
+  integer,intent(in)            :: nVV
+  double precision,intent(in)   :: eta
+  double precision,intent(in)   :: lambda
+  double precision,intent(in)   :: eGW(nBas)
+  double precision,intent(in)   :: Om(nS)
+  double precision,intent(in)   :: rho(nBas,nBas,nS)
+  double precision,intent(in)   :: OmBSE
+  
+! Local variables
+
+  double precision              :: dem,num
+  integer                       :: m
+  integer                       :: a,b,c,d
+  integer                       :: ab,cd
+
+! Output variables
+
+  double precision,intent(out)  :: KC_dyn(nVV,nVV)
+  double precision,intent(out)  :: ZC_dyn(nVV,nVV)
+
+! Initialization
+
+  KC_dyn(:,:) = 0d0
+  ZC_dyn(:,:) = 0d0
+
+! Build dynamic A matrix
+
+  if(ispin == 1) then
+
+    ab = 0
+    do a=nO+1,nBas-nR
+      do b=a,nBas-nR
+        ab = ab + 1
+ 
+        cd = 0
+        do c=nO+1,nBas-nR
+          do d=c,nBas-nR
+            cd = cd + 1
+  
+            do m=1,nS
+
+              dem = OmBSE - eGW(c) - Om(m) - eGW(b)
+              num = rho(a,c,m)*rho(b,d,m)
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) + num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) - num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+              dem = OmBSE - eGW(c) - Om(m) - eGW(a)
+              num = rho(b,c,m)*rho(a,d,m)
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) - num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) + num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+              dem = OmBSE - eGW(d) - Om(m) - eGW(a)
+              num = rho(a,c,m)*rho(b,d,m) 
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) + num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) - num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+              dem = OmBSE - eGW(d) - Om(m) - eGW(b)
+              num = rho(b,c,m)*rho(a,d,m)
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) - num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) + num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+            end do
+
+          end do
+        end do
+
+      end do
+    end do
+
+  end if
+
+ if(ispin == 2) then
+
+    ab = 0
+    do a=nO+1,nBas-nR
+      do b=a+1,nBas-nR
+        ab = ab + 1
+
+        cd = 0
+        do c=nO+1,nBas-nR
+          do d=c+1,nBas-nR
+            cd = cd + 1
+
+            do m=1,nS
+
+              dem = OmBSE - eGW(c) - Om(m) - eGW(b)
+              num = rho(a,c,m)*rho(b,d,m)
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) + num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) - num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+              dem = OmBSE - eGW(c) - Om(m) - eGW(a)
+              num = rho(b,c,m)*rho(a,d,m)
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) - num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) + num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+              dem = OmBSE - eGW(d) - Om(m) - eGW(a)
+              num = rho(a,c,m)*rho(b,d,m) 
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) + num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) - num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+              dem = OmBSE - eGW(d) - Om(m) - eGW(b)
+              num = rho(b,c,m)*rho(a,d,m)
+
+              KC_dyn(ab,cd) = KC_dyn(ab,cd) - num*dem/(dem**2 + eta**2)
+              ZC_dyn(ab,cd) = ZC_dyn(ab,cd) + num*(dem**2 - eta**2)/(dem**2 + eta**2)**2
+
+            end do
+
+          end do
+        end do
+
+      end do
+    end do
+
+  end if
+end subroutine