\section{Introduction}
-In PAN 2013 competition on plagiarism detection we participated in both the Source Retrieval
+In PAN 2013\footnote{%
+See \cite{pan2013} for an overview of PAN 2013 plagiarism detection campaign.}
+ competition on plagiarism detection we participated in both the Source Retrieval
and the Text Alignment subtasks. In both tasks we adapted methodology used in PAN 2012\footnote{%
See \cite{pan2012} for an overview of PAN 2012 plagiarism detection campaign.} \cite{suchomel_kas_12}.
Section~\ref{source_retr} describes querying approach for source retrieval, where we used three different