@book{3249,
	author = {Florey C du V.},
	title = {Methods for cohort studies of chronic airflow limitation.},
	publisher = {WHO Regional office for Europe,},
	year = {1982.},
	series = {WHO Regional publications, European series ;},
	address = {Copenhagen : },
	url = {https://iris.who.int/handle/10665/272812}
}