Shay Mozes Dekel Tsur Oren Weimann Michal Ziv-Ukelson Fast Algorithms for Computing Tree LCS. 230-243 2008 CPM http://dx.doi.org/10.1007/978-3-540-69068-9_22 conf/cpm/2008 db/conf/cpm/cpm2008.html#MozesTWZ08