@article {9877,
	title = {Imaging of polar surfaces: Atomic resolution with a charged tip},
	journal = {Surface Science},
	year = {2002},
	pages = {L547-L552},
	doi = {10.1016/S0039-6028(02)02093-9},
	author = {Jianxin Zhong and Qian Niu and Zhenyu Zhang}
}
