@book{9014,
	author = {Mncke, Hans Guido... [et al.]. and Kratz, Manfred},
	title = {Measuring of NO, NO2, SO2 and O3.},
	publisher = {WHO Collaborating Centre for Air Quality Management and Air Pollution Control,},
	year = {2003.},
	series = {(European intercomparison workshops on air quality monitoring ; vol. 5); (Air hygiene report ; 15)},
	address = {Berlin, Germany : }
}