@article {Liu2014,
	title = {Uncovering patterns of inter-urban trip and spatial interaction from social media check-in data},
	journal = {PLoS ONE},
	volume = {9},
	number = {1},
	year = {2014},
	note = {施引文献 23},
	doi = {10.1371/journal.pone.0086026},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84898438317\&partnerID=40\&md5=bb8d0d6a2ecc0b39295abd9d127d4b14},
	author = {Y. Liu and Sui, Z. and Kang, C. and Y. Gao}
}
