@article {le1996surveillance,
	title = {Surveillance of clustering near point sources},
	journal = {Statistics in Medicine},
	volume = {15},
	number = {7-9},
	year = {1996},
	pages = {727{\textendash}740},
	publisher = {Wiley Online Library},
	author = {Le, Nhu D and Petkau, A.John and Rosychuk, R}
}
