구글 검색 알고리즘의 원리

http://markov.tistory.com/2

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http://www.cems.uvm.edu/~lakobati/AppliedUGMath/other_Google/Wills.pdf

http://www.cs.helsinki.fi/u/linden/teaching/irr06/papers/petteri_huuhka_google_paper.pdf