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A local source is a node of a directed graph with no entering edges (Borowski and Borwein 1991, p. 401; left figure), and a global source (often simply called a source) is a node in a directed graph which reaches all other nodes (Harary 1994, p. 201; right figure).
Borowski, E. J. and Borwein, J. M. (Eds.). The HarperCollins Dictionary of Mathematics. New York: HarperCollins, 1991.
Harary, F. Graph Theory. Reading, MA: Addison-Wesley, 1994.
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اختراق جديد في علاج سرطان البروستات العدواني
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مدرسة دار العلم.. صرح علميّ متميز في كربلاء لنشر علوم أهل البيت (عليهم السلام)
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