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با سلام دوتا مقاله زیر رو می خواستم خیلی ممنونم
title>>On directed Steiner trees
author>> Leonid Zosin
link>>http://portal.acm.org/citation.cfm?id=545388
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title>>Approximation algorithms for directed Steiner problems
author>>Moses Charikar
link>>http://portal.acm.org/citation.cfm?id=314700
title>>On directed Steiner trees
author>> Leonid Zosin
link>>http://portal.acm.org/citation.cfm?id=545388
-----------------
title>>Approximation algorithms for directed Steiner problems
author>>Moses Charikar
link>>http://portal.acm.org/citation.cfm?id=314700