@ -138,7 +138,7 @@
\bibitem{pac13}
J. Pachocki and J. Radoszweski.
Where to use and how not to use polynomial string hashing.
\emph{Olympiads in Informatics}, 2013.
\emph{Olympiads in Informatics}, 7(1):90--100, 2013.
\bibitem{pri57}
R. C. Prim.