Questo codice
`\begin{filecontents}{bibliografia.bib}
@book{Jan10:jan,
author = {Dietmar Jannach, Markus Zanker, Alexander Felfernig},
journal = {Rivista sconosciuta},
publisher = {Cambridge University Press},
title = {Recommender Systems: An Introduction},
year = {2010}
}
\end{filecontents}
\documentclass[a4paper,11pt]{article}
\usepackage[english]{babel}
\usepackage[style=alphabetic]{biblatex}
\usepackage[babel]{csquotes}
\bibliography{bibliografia}
\begin{document}
\noindent \textbf{A survey about matrix and tensor factorization}\\
\linespread{2.0}
\\
\indent The Recommender Systems \cite{Jan10:jan} represent a response to the problem of Information Overload. RS are now a widely recognized field of research.\\
\printbibliography
\end{document}`
compilato al solito modo, funziona? Io non ottengo nessun errore, e funziona.
Ciao
Orlando