diff --git a/BSEdyn.tex b/BSEdyn.tex
index 194a1b3..96e1dcd 100644
--- a/BSEdyn.tex
+++ b/BSEdyn.tex
@@ -376,7 +376,7 @@ In the following, $i$ and $j$ are occupied orbitals, $a$ and $b$ are unoccupied
 %\titou{namely $GW$ quasiparticle energies and input Hartree-Fock molecular orbitals in the present study. (T2: shall we really mention this here?)}
 After projecting onto $\phi_a^*(\bx_1) \phi_i(\bx_{1'})$, one gets
 \begin{multline}
-	\int d\bx_1 d\bx_{1'} \; \phi_a^*(\bx_1) \phi_i(\bx_{1'})  L_0(\bx_1,3;\bx_{1'},4; \Oms) 
+	\int d\bx_1 d\bx_{1'} \; \phi_a^*(\bx_1) \phi_i(\bx_{1'})  L_0(\bx_1,4;\bx_{1'},3; \Oms) 
 	\\
 	= 
 	\frac{ \phi_a^*(\bx_3) \phi_i(\bx_4)  e^{i \Oms t^{34} }} {   \Oms - (  \e{a} - \e{i} )  + i \eta }