Paper  doi  bibtex   

@article{beasley_controlled_2019,
	title = {Controlled {Trial} of {Budesonide}–{Formoterol} as {Needed} for {Mild} {Asthma}},
	volume = {380},
	issn = {0028-4793, 1533-4406},
	url = {http://www.nejm.org/doi/10.1056/NEJMoa1901963},
	doi = {10.1056/NEJMoa1901963},
	language = {en},
	number = {21},
	urldate = {2020-08-23},
	journal = {New England Journal of Medicine},
	author = {Beasley, Richard and Holliday, Mark and Reddel, Helen K. and Braithwaite, Irene and Ebmeier, Stefan and Hancox, Robert J. and Harrison, Tim and Houghton, Claire and Oldfield, Karen and Papi, Alberto and Pavord, Ian D. and Williams, Mathew and Weatherall, Mark},
	month = may,
	year = {2019},
	note = {Number: 21},
	pages = {2020--2030},
}