Probabilistic Approaches to Recommendations
Barbieri, N. ; Manco, G. ; Ritacco, E.
http://ieeexplore.ieee.org/xpl/bkabstractplus.jsp?bkn=6828868
或者
http://www.morganclaypool.com/doi/abs/10.2200/S00574ED1V01Y201403DMK009
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