毕业论文，求找四篇外文文献
Dorigo M. On the Internet marketing strategy of micro-letter marketing[J].Internet World，2012(04):33-36
Luis. The microblogging marketing under Asymmetric Information moral hazard Analysis and Strategy Research[J].Advertisers，2013(4):23-28.
Stengos. Ant clustering class combination method of the parameter M[J].Modern Enterprise Education，2011(19):43-44.
Russ Martin. The Chat App Challenge[J].Marketing Magazine,2013,118（6）:11