@article {1288,
	title = {Effects of atmospheric ammonia (NH3) on terrestrial vegetation: a review},
	journal = {Environmental Pollution},
	volume = {124},
	year = {2003},
	pages = {179-221},
	author = {Krupa, S.V.}
}
@inbook {1583,
	title = {Effects of sulphur dioxide.},
	booktitle = {Air Pollution and plant life},
	year = {2002},
	pages = {135-162},
	publisher = {John Wiley \& Sons},
	organization = {John Wiley \& Sons},
	edition = {2nd},
	address = {Chichester},
	author = {Legge, A.H. and Krupa, S.V.}
}
