Improved approximation of the largest common subtree of two unordered trees of bounded height.

Tatsuya Akutsu Daiji Fukagawa Atsuhiro Takasu Improved approximation of the largest common subtree of two unordered trees of bounded height. 165-170 2008 109 Inf. Process. Lett. 2 http://dx.doi.org/10.1016/j.ipl.2008.09.025 db/journals/ipl/ipl109.html#AkutsuFT08