@article {hu2012replacing,
	title = {Replacing a battery by a nanogenerator with 20 V output},
	journal = {Advanced Materials},
	volume = {24},
	number = {1},
	year = {2012},
	pages = {110{\textendash}114},
	publisher = {Wiley Online Library},
	author = {Hu, Youfan and Lin, Long and Yan Zhang and Wang, Zhong Lin *}
}
