\documentclass{llncs}
\usepackage[numbers]{natbib}
\usepackage[utf8]{inputenc}
\usepackage{amsmath,amsfonts}
\usepackage{algorithm, algpseudocode}
\usepackage{bbm,color,verbatim}
\input{definitions}
\usepackage[pagebackref=true,breaklinks=true,colorlinks=true]{hyperref}
\title{Budget Feasible Mechanisms\\ for Experimental Design}
\author{
    Thibaut Horel\inst{1}
    \and
    Stratis Ioannidis\inst{2}
    \and
    S. Muthukrishnan\inst{3}
}
\institute{Harvard University, \email{thibaut.horel@normalesup.org}
    \and
    Technicolor, \email{stratis.ioannidis@technicolor.com}
    \and
    Rutgers University, \email{muthu@cs.rutgers.edu}
}
\begin{document}
\maketitle
\vspace{2em}
\input{abstract}
\end{document}