Adjustments to intros and conclusions

Signed-off-by: Riccardo Finotello <riccardo.finotello@gmail.com>

sec/part2/divergences.tex

@@ -9,7 +9,7 @@ In what follows we show a direct computation showing that the presence of the di
 
 Unnoticed in the Null Boost Orbifold (\nbo) \cite{Liu:2002:StringsTimeDependentOrbifold}, even the four \emph{open string} tachyons amplitude is divergent.
 Since we are working at tree level gravity is not an issue.
-In fact in Equation (6.16) of \cite{Liu:2002:StringsTimeDependentOrbifold} the four tachyons amplitude in the divergent region reads
+In fact in~\cite{Liu:2002:StringsTimeDependentOrbifold} the four tachyons amplitude in the divergent region reads
 \begin{equation}
   A_4 \sim \int\limits_{q \sim \infty} \frac{\dd{q}}{\abs{q}} \ccA( q )
 \end{equation}