\section{Question 1}
\input{question1.tex}
-\section{Question 2}
+\section{Question 2} \label{sec:q2}
\input{question2.tex}
\section{Question 3}
\input{question4.tex}
\appendix
-\section{Models}
+\section{Models} \label{app:models}
\input{models.tex}
\nocite{*}