@conference {Zhang2006,
	title = {A spatial reference frame model of Beijing based on spatial cognitive experiment},
	booktitle = {Proceedings of SPIE - The International Society for Optical Engineering},
	volume = {6418},
	year = {2006},
	note = {施引文献 0},
	doi = {10.1117/12.712925},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33846804079\&partnerID=40\&md5=0346db31469feb256a4be3b8d6ab731f},
	author = {J. Zhang and J. Zhang and Y. Liu}
}
