Main root file for a latex project

latex-main

\documentclass[a4paper,11pt]{article}
\usepackage{graphicx}
\usepackage{ifpdf}
\ifpdf
   % put here packages only for the PDF:
   \DeclareGraphicsExtensions{.pdf,.png,.jpg,.mps}
   \usepackage{hyperref} 
   \usepackage{todonotes}
\else
   % put here packages only for the DVI:
\fi
%\usepackage[parfill]{parskip}    % Activate to begin paragraphs with an empty line rather than an indent

\usepackage{amssymb}

%-------------------- custom configurations ------------------------
%\linespread{1.5} % Double spaced text
\usepackage[semicolon,authoryear]{natbib}
%\bibpunct{(}{)}{;}{a}{}{;} %configure punctuation: use parentheses (), semicolon to separate, and author-year style

% numbering reset and prefixed for each section
\usepackage{amsmath}
\numberwithin{equation}{section}
\numberwithin{figure}{section}

%---------------------------------------------------------------

%----------------------- title info -----------------------------
\title{Title}
\author{Author}
%\date{}  % Activate to display a given date or no date
%---------------------------------------------------------------

\begin{document}
\maketitle
%---------------------------------------------------------------

\input{./tex/abstract}

\input{./tex/1one}
%====================================================
%\newpage
\bibliographystyle{IEEEtranN}
\bibliography{bibfile}

\end{document}