...Graphs

This work was supported in part by the National Science Council of the Republic of China under Contract NSC 87-2213-E-009-100.

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...Hsu

Correspondence to: Professor L.H. Hsu, Department of Computer and Information Science, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C. e-mail: lhhsu@cc.nctu.edu.tw.

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