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Langville, A.N.; Meyer, C.D.: Google's PageRank and beyond : the science of search engine rankings (2006)
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Veltman, K.H.: Frontiers in conceptual navigation (1997)
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Veltman, K.: Frontiers in conceptual navigation (1998)
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Borwein, J.; Stanway, T.: Knowledge and community in mathematics (2005)
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Frakes, W.B.: Introduction to information storage and retrieval systems (1992)
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