Modified subfolder nesting and added dummy text

source/chapters/abstract.tex

@@ -0,0 +1,3 @@
+\begin{abstract}
+  \lipsum
+\end{abstract}

source/chapters/introduction.tex

@@ -0,0 +1 @@
+\section{Introduction}

source/paper.tex

@@ -1,4 +1,4 @@
-\documentclass[10pt, a4paper, twocolumn]{article}
+\documentclass[10pt, a4paper, twocolumn, notitlepage]{article}
 \usepackage[utf8]{inputenc}
 \usepackage{lipsum}
 
@@ -8,14 +8,12 @@
 
 \begin{document}
 
-\begin{titlepage}
 \maketitle
-\end{titlepage}
 
-\include{chapters/abstract}
-\include{chapters/introduction}
-\include{chapters/sections}
-\include{chapters/conclusions}
-\include{chapters/references}
+\include{sections/abstract}
+\include{sections/introduction}
+\include{sections/sections}
+\include{sections/conclusions}
+\include{sections/references}
 
 \end{document}

source/sections/abstract.tex

@@ -0,0 +1,3 @@
+\begin{abstract}
+  \lipsum[10]
+\end{abstract}

source/sections/conclusions.tex

@@ -0,0 +1,2 @@
+\section{Conclusions}
+  \lipsum[1]

source/sections/introduction.tex

@@ -0,0 +1,2 @@
+\section{Introduction}
+  \lipsum[1]

source/sections/references.tex

@@ -0,0 +1,2 @@
+\section{References}
+  \lipsum[1]

source/sections/sections.tex

@@ -0,0 +1,2 @@
+\section{Sections}
+  \lipsum[2-8]