@article {36459,
	title = {Investigation of air quality data : application of polar coordinate representations},
	volume = {5},
	year = {1989},
	pages = {265-271},
	publisher = {AOSTRA  Journal of Research},
	address = {{\textquoteleft}},
	author = {Denney, D. W. and Hoyle, R. E. and Liu, J. K.}
}
