\documentclass[10pt,fleqn,cmfonts]{book}
\usepackage[ a5paper,  twoside, inner=15mm,outer=15mm,top=20mm,bottom=10mm] {geometry}

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\usepackage[T1]{fontenc}
\usepackage{amssymb}
\usepackage{etoolbox}
\newcommand{\titulo}[1]{ \textbf{\large#1}\vspace*{.2cm}}
\newcommand{\autor}[1]{#1}
\newcommand{\autorp}[1]{\textsf{#1}}
\newcommand{\afil}[2]{\mbox{} \\ \textit{#1}, \textit{#2}\vspace*{.125cm}}
\newcommand{\pchave}[1]{{\small \textbf{Keywords}: #1\\}}
\patchcmd{\thebibliography}{\chapter*}{\section*}{}{}
\renewcommand\bibname{\small References}
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\begin{document}

% Insert the title of the talk


\begin{minipage}[c]{20cm}
{\it Symposium on Big Data in Finance, Retail and Commerce:}\\
{\it Statistical and Computational Challenges}\\
Lisbon, 2-3 November 2017, Portugal
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\vspace{1cm}


\titulo{Talk title}
\medskip

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% Insert a line with the format below for each author.  Leave a blank line between authors.
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\autor{\textbf{Author 1 (Speaker)}} \afil{affiliation}{email}

\autor{Author 2 } \afil{affiliation}{email}

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\vspace{1cm}


\textbf {Abstract}\\
...\\
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% insert here the abstract
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% Include some keywords  
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\pchave{...}
\medskip

\textbf {Introduction}\,...\\
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% insert here the introduction 
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\medskip

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% insert in sections A, B,..., the results 
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\textbf {[Section A]}\,...\\

\textbf {[Section B]}\,...\

$\vdots$\\


\medskip

\textbf {Conclusions}\,...\\

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% insert here the conclusions
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\medskip
\textbf {Acknowledgments}\,...
\\

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%The bibliography is optional. Use the following: \cite{SurnameYear} 
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\begin{thebibliography}{}
\bibitem{Surname2017}% paper in a journal
Surname, N., Surname, N. (year) Paper title. \textit{Journal Title} volume, pages.

\bibitem{Surname2017}% book
Surname, N. (year) \textit{Book Title}. Publisher, address.  

\bibitem{Surname2017}% paper in proceedings
Surname, N.  (year) Paper title. \textit{Proceedings of...}, Editor, publisher, volume, pages.
\end{thebibliography}


\end{document}

