%&LaTeX
\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\section*{1991}

Corrado B{\~A}{\textparagraph}hm, and Enrico Tronci. "About Systems of Equations, X-Separability, and Left-Invertibility in the lambda-Calculus." \textit{Inf. Comput.} 90, no. 1 (1991): 1--32. DOI: 10.1016/0890-5401(91)90057-9.

\end{document}

