\input zb-basic
\input zb-ioport
\iteman{io-port 70912903}
\itemau{Wang, Lusheng; Zhang, Kaizhong}
\itemti{Space efficient algorithms for ordered tree comparison}
\itemso{ISAAC, 380-391 (2005).}
\itemcc{}
\itemut{}
\itemli{doi:10.1007/11602613\_39}
\end