The Lowest Common Ancestor Problem on a Tree with an Unfixed Root.

Biing-Feng Wang Jiunn-Nan Tsai Yuan-Cheng Chuang The Lowest Common Ancestor Problem on a Tree with an Unfixed Root. 125-130 1999 119 Inf. Sci. 1-2 db/journals/isci/isci119.html#WangTC99