%&LaTeX
\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Billangeon+Nakamura2011} Billangeon, P. - M., \& Nakamura, Y. (2011). Superconducting devices: Quantum cups and balls. \textit{Nat. Phys.}, \textit{7}(8), 594--595.

\end{thebibliography}

\end{document}

