@book{38196,
	author = {Holford, Theodore R.},
	title = {Multivariate methods in epidemiology},
	publisher = {Oxford University Press,},
	year = {2002.},
	series = {Monographs in epidemiology and biostatistics ;},
	address = {New York ;},
	url = {http://dx.doi.org/10.1093/acprof:oso/9780195124408.001.0001}
}