\documentclass[12pt,a4paper]{article}
%%%%%
% Template for writing a Thesis in Faculty of Science, Charles University.
% It is not necessary to change this page.
% Automatically exports to PDF type A-2u.
%%%%%
%%% Packages %%%
% For Text and PDF management
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{parskip}
\usepackage{setspace}
\usepackage[pdfa,unicode]{hyperref}
\hypersetup{hidelinks}
\usepackage[a-2u]{pdfx}
\emergencystretch=1em
% For Tables and Figures management
\usepackage{graphicx}
\usepackage{caption}
\captionsetup[table]{skip=10pt}
\usepackage{multirow}
\usepackage{booktabs}
\usepackage{tablefootnote}
% Chemistry and math notations
\usepackage[version=4]{mhchem}
\usepackage{amsmath}
% Others
\usepackage{lipsum}
\usepackage{datetime}
\newdateformat{mydate}{\THEDAY. \THEMONTH. \THEYEAR}
%%%
%%% Setting up the PDF %%%
% Spacing between paragraphs
\setlength{\parskip}{10pt}
% Indentation size
\setlength{\parindent}{15pt}
% Margins
\usepackage[a4paper, left=2.5cm, right=2.5cm, top=2.5cm, bottom=2.5cm]{geometry}
%%%
% Setting up the Bibliography
\usepackage[sort&compress,numbers,super]{natbib}
\bibliographystyle{achemso}
% Begin document
\begin{document}
\setstretch{1.5}
\include{1_titlepage}
\include{2_abstract}
\include{3_introduction}
\include{4_methods}
\include{5_results}
\include{6_discussion}
\include{7_conclusion}
\setstretch{1}
\addcontentsline{toc}{section}{References}
\bibliography{references}
\end{document}
