Miroslaw Kowaluk, Andrzej Lingas. Unique Lowest Common Ancestors in Dags Are Almost as Easy as Matrix Multiplication. In Lars Arge, Michael Hoffmann, Emo Welzl, editors, Algorithms - ESA 2007, 15th Annual European Symposium, Eilat, Israel, October 8-10, 2007, Proceedings. Volume 4698 of Lecture Notes in Computer Science, pages 265-274, Springer, 2007. [doi]
Abstract is missing.