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%  Template of Systematic Review  Article                                %
%  C.E.S.A.R - Centro de Estudos e Sistemas Avançados do Recife         %
%  https://www.cesar.school/                                            %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[10pt, twocolumn]{article}
 
\title{\textbf{Literature Systematic Review  Title}}
\author{
    \fontsize{11}{13}\selectfont 
    1\ts{st} Author's Name \\
    \fontsize{10}{11}\selectfont 
    C.E.S.A.R\\
    \fontsize{10}{11}\selectfont 
    Recife, Brasil\\
    \fontsize{10}{11}\selectfont
    email@cesar.school\\
    \and
    \fontsize{11}{13}\selectfont 
    2\ts{nd} Author's Name\\
    \fontsize{10}{11}
    \selectfont C.E.S.A.R\\
    \fontsize{10}{11}\selectfont 
    Recife, Brasil\\
    \fontsize{10}{11}\selectfont
    email@cesar.school\\
     \and
    \fontsize{11}{13}\selectfont 
    Supervisor's Name\\
    \fontsize{10}{11}
    \selectfont C.E.S.A.R\\
    \fontsize{10}{11}\selectfont 
    Recife, Brasil\\
    \fontsize{10}{11}\selectfont
    email@cesar.school\\
}
\date{}
%%%%%%%%%%%%%%%%%
% import packages %
%%%%%%%%%%%%%%%%%
\usepackage{lipsum}
\usepackage{lmodern} % customize author's fontsize
% setting page settings and layout 
% https://texdoc.org/serve/geometry/0
\usepackage[
layout=letterpaper, 
paper=letterpaper, 
portrait, 
head=0.5in,
foot=0.5in,
top=1in, 
bottom=1in, 
left=0.75in, 
right=0.75in
]{geometry}
\usepackage[english,brazilian]{babel}
\setlength{\columnsep}{0.25in} % space/gap between columns
\pagenumbering{gobble}  % supress page number
\usepackage{xurl}
\usepackage[hyperpageref]{backref}	 %  link to bib citations
\usepackage[runin]{abstract}
\usepackage{hyperref} % it needs to come before abntex2cite
\hypersetup{
colorlinks=true,
urlcolor=blue,
linkcolor=blue,
citecolor=blue,
pdftitle={@title - @author},
pdfsubject={Systematic Review},
pdfauthor={@author},
pdfkeywords={list; here; your; keywords (key words)}
}
\usepackage[num,abnt-etal-cite=3]{abntex2cite}
\citebrackets[] % use square brackets on citation
% https://ctan.dcc.uchile.cl/macros/latex/contrib/abntex2/doc/abntex2cite.pdf pg. 7
\usepackage{etoolbox}
\usepackage{indentfirst} % ident section's paragraphs
\def\ni{\noindent} % remove abstract pragraph
\usepackage{custom_commands} % custom commands, including abstract text
\usepackage{subfiles} % best loaded last in the preamble
\usepackage[pdftex]{graphicx} % add images
% multiple bibliografy files
% https://www.overleaf.com/learn/latex/Questions/Creating_multiple_bibliographies_in_the_same_document
\usepackage[resetlabels,labeled]{multibib}
\newcites{LSR}{Literature Systematic Reviews Reading}
\newcites{CC}{Computer Science Readings}
\begin{document}
\renewcommand{\abstractname}{} % remove 'Abstract' title
\maketitle % create title and authors
%%%%%%%%%%%%
% Abstract %
%%%%%%%%%%%%
%% remover espaçamento do abstract
\setlength{\absleftindent}{0em}
\setlength{\absrightindent}{0em}
\begin{abstract}
    \abstractText % see custom_commands
\end{abstract}
%%%%%%%%%%%
% Article %
%%%%%%%%%%%
\section{INTRODUCTION}
\subfile{sections/introduction}
\section{THEORETICAL BACKGROUND}
\subfile{sections/theoretical-background}
\section{FINAL CONSIDERATIONS}
\subfile{sections/final-considerations}
%%%%%%%%%%%%%%
% References
%%%%%%%%%%%%%%
\bibliography{refs}
\end{document}