Anders Dessmark Jesper Jansson Andrzej Lingas Eva-Marta Lundell Polynomial-Time Algorithms for the Ordered Maximum Agreement Subtree Problem. 233-248 2007 48 Algorithmica 3 http://dx.doi.org/10.1007/s00453-007-0080-9 db/journals/algorithmica/algorithmica48.html#DessmarkJLL07