@article {ghement2007seasonal,
	title = {Seasonal confounding and residual correlation in analyses of health effects of air pollution},
	journal = {Environmetrics},
	volume = {18},
	number = {4},
	year = {2007},
	pages = {375{\textendash}394},
	publisher = {Wiley Online Library},
	author = {Ghement, Isabella R and Heckman, Nancy E and Petkau, A.John}
}
