@article {10812,
	title = {Quantum size effects on the perpendicular upper critical field in ultrathin lead films},
	journal = {Physical Review Letters},
	year = {2005},
	doi = {10.1103/PhysRevLett.95.247005},
	author = {Xin-Yu Bao and Yan-Feng Zhang and Yupeng Wang and Jin-Feng Jia and Qi-Kun Xue and X.C. Xie and Zhong-Xian Zhao}
}
