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​http://staff.ustc.edu.cn/~zwp/teach/Stat-Comp/Efron_Bootstrap_CIs.pdf
​http://socserv.mcmaster.ca/jfox/Books/Companion/appendix-bootstrapping.pdf
​http://statwww.epfl.ch/davison/BMA/
​http://www.mayin.org/ajayshah/KB/R/documents/boot.htm
​http://cran.r-project.org/doc/Rnews/Rnews_2002-3.pdf
​http://cran.r-project.org/web/packages/bootstrap/bootstrap.pdf