Yang Dai
and Naoki Katoh
Proc. 4th Int. Conf. Computing and Combinatorics (COCOON 1998), Lecture Notes in Computer Science 1449, Wen-Lian Hsu
and Ming-Yang Kao, ed., Springer-Verlag, 1998, pp. 15–24
http://www.is.titech.ac.jp/~dai/ratioCo.ps
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