摘要：
http://users.soe.ucsc.edu/~draper/eBay-Google-2013.htmlhttp://www.cs.ust.hk/~qyang/Teaching/537/PPT/em-note.pdfhttp://blog.csdn.net/yangliuy/article/details/8302599http://blog.csdn.net/yangliuy/article/details/8457329https://www.ipam.ucla.edu/schedule.aspx?pc=gss2012https://www.ipam.ucla.edu/publica 阅读全文
摘要：
http://www.cnblogs.com/tornadomeet/archive/2013/05/02/3053916.html 阅读全文