Du, Ding-ZhuDing-ZhuDuHsu, Frank D.Frank D.Hsu呂育道Lyuu, Yuh-DauhYuh-DauhLyuu2009-04-202018-07-052009-04-202018-07-051993http://ntur.lib.ntu.edu.tw//handle/246246/151105en-USLine Digraph Iterations and the Spread Conceptjournal article