@article {1972841,
	title = {Identifying valuable customers on social network sites for profit maximization},
	journal = {Expert Systems with Applications},
	volume = {39},
	year = {2012},
	month = {2012},
	pages = {13009-13018},
	keywords = {BIS},
	author = {Xu,Kaiquan and Li,Jiexun and Song,Yuxia}
}