\documentclass[8pt,fleqn,cmfonts]{book}
\usepackage[ a5paper,  twoside, inner=15mm,outer=15mm,top=20mm,bottom=10mm] {geometry}

%%
%%   Do not change the configuration below.
%%
\parindent 0cm
\pagestyle{empty}
\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}
%%
%%
%%

\begin{document}

% Insert the title of the talk
\titulo{Talk title}
\medskip

%
% Insert a line with the format below for each author.  Leave a blank line between authors.
% 
\autor{\textbf{Author 1}} \afil{affiliation}{author1@univ.pt}

\autor{Author 2 } \afil{affiliation}{author2@univ.pt}

\medskip   

% 
% Include some keywords  
%
\pchave{...}
\medskip

%
% insert here the abstract
%
{\textbf{\small Abstract}}: ...


%
%The bibliography is optional. Use the following: \cite{SurnameYear} 
%
\begin{thebibliography}{}
\bibitem{Surname2014}% paper in a journal
Surname, N., Surname, N.M. Paper title. \textit{Journal title}, 68, 257--270, 2014.

\bibitem{Surname2013}% book
Surname, N. \textit{Book title}. Edi��es SPE, Lisboa, 2013.

\bibitem{Surname2012}% paper in proceedings
Surname, N.  Paper title. \textit{Proceedings of the  Symposium  ...}, Vol II, 53--58, 2012.
\end{thebibliography}


\end{document}

