

@article {4132,
	title = {{Long-term study of Cryptosporidium and Giardia occurrence and quantitative microbial risk assessment in surface waters of Arizona in the USA}},
	journal = {Journal of Water and Health},
	volume = {6},
	year = {2008},
	pages = {263{\textendash}273},
	author = {Ryu, H and Abbaszadegan, M}
}
