9Bennett, S. , Maton K. , & Kervin, L. ( 2008 ). The ' digital natives' debate:A critical review of the evidence[J]. British journal of educational technology,39(5) :775-786.
10Blei, D. (2011). Introduction to pmbabilistic topic models [ EB/OL]. Communications of the ACM ( in press). [ 2011-10-30 ]. http ://www. cs. princeton. edu/-blei/papers/Blei2011. pdf.
