\r
Our approach at the text alignment subtask of PAN 2013 uses the same\r
basic principles as our previous work in this area, described\r
-in \cite{Suchomel2012}, which in turn builds on our work for previous\r
+in \cite{suchomel_kas_12}, which in turn builds on our work for previous\r
PAN campaigns,, \cite{Kasprzak2010}, \cite{Kasprzak2009a}:\r
\r
We detect {\it common features} between source and suspicious documents,\r