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== 참고 문헌 ==
* {{citation인용|language=en|last=Biggs|first=Norman L.|title=Discrete Mathematics|publisher=Clarendon Press|place=Oxford|year=1985|isbn=0-19-853252-0}}
* {{citation인용|language=en|last=Brualdi|first=Richard A.|title=Introductory Combinatorics|edition=5th|year=2010|publisher=Prentice Hall|place=Upper Saddle River, NJ |isbn=0-13-602040-2}}
* {{citation인용|language=en|last1=Roberts|first1=Fred S.|last2=Tesman|first2=Barry|title=Applied Combinatorics|edition=2nd|publisher=CRC Press|place=Boca Raton|year=2009|isbn=978-1-4200-9982-9}}
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