@article {21505,
	title = {Optimal Subsampling for Big Data Regressions},
	journal = {Statistica Sinica},
	year = {2020},
	url = {http://www3.stat.sinica.edu.tw/ss_newpaper/SS-2018-0439_na.pdf},
	author = {Minyao Ai and Jun Yu and Huiming Zhang and Haiying Wang}
}
