Merge overleaf-2020-02-06-1504 into master

BSE-PES.tex

@@ -247,7 +247,7 @@ In order to compute the neutral (optical) excitations of the system and their as
 \label{eq:BSE}
 	\LBSE{}(1,2,1',2') = \LBSE{0}(1,2,1',2') 
 	\\
-	+ \int d3 d4 d5  d6 \LBSE{0}(1,4,1',3) \XiBSE{}(3,5,4,6) \LBSE{}(6,2,5,2')
+	+ \int d3 d4 d5  d6  \LBSE{0}(1,4,1',3) \XiBSE{}(3,5,4,6) \LBSE{}(6,2,5,2')
 \end{multline}
 as the linear response of the one-body Green's function $\G{}$ with respect to a general non-local external potential
 \begin{equation}