\documentclass{article}
\usepackage[TS1,T1]{fontenc}
\usepackage{newtxtext,newtxmath}
\usepackage[style=numeric]{biblatex}
\bibliography{bibdemo}
\pagestyle{empty}
\begin{document}
See \cite{lcompanion} and \cite{bacgri2003}.

\printbibliography

\end{document}
