\documentclass[a4paper,11pt]{article}
\usepackage[ngerman,english]{babel}
\usepackage{amsmath}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage[babel]{microtype}
\usepackage{geometry}
\geometry{a4paper,left=4cm,right=20mm,top=3cm,bott om=25mm}
\usepackage{here}
\usepackage{textcomp}
\usepackage{amssymb}
\usepackage[breaklinks]{hyperref}
\hypersetup{
pdfauthor={Ich Selbst},
pdftitle={Ph.D.},
pdfsubject={Dissertation},
urlcolor=blue,
}
% #1: number of distinct back references
% #2: backref list with distinct entries
% #3: number of back references including duplicates
% #4: backref list including duplicates
\RequirePackage[hyperpageref]{backref}
\renewcommand{\backreflastsep}{ and~}
\renewcommand{\backreftwosep}{ and~}
\renewcommand{\backref}[1]{}% for backref < 1.33 necessary
\renewcommand{\backrefalt}[4]{
\ifnum#1=0
%No cited.
\else
\ifnum#1=1
\footnotesize (Cited on page #2)
\else
\footnotesize (Cited on pages #2)
\fi
\fi
}
\usepackage[colorlinks, % Inhaltsverzeichnis im PDF
pdfpagelabels,
pdfstartview = FitH,
bookmarksopen = true,
bookmarksnumbered = true,
linkcolor = black,
plainpages = false,
hypertexnames = false,
citecolor = black] {hyperref}
\renewcommand{\textfraction}{0.0}
\renewcommand{\topfraction}{1.0}
\renewcommand{\bottomfraction}{1.0}
\setlength{\parindent}{0pt}
\begin{document}
\bibliographystyle{alpha}
Beispieltext \cite{Bartolietal2005}
\bibliography{Literaturdatenbank}
\end{document}
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