@article {lbnwhys78,
	title = {Escherichia coli strains that cause diarrhoea but do not produce heat-labile or heat-stable enterotoxins and are non-invasive},
	journal = {Lancet.},
	volume = {1},
	year = {1978},
	pages = {8074},
	author = {Levine, M M and Bergquist, E J and Nalin, D R and Waterman, D H and Hornick, R B and Young, C R and Sotman, S}
}
@article {lrchny80,
	title = {Lack of Person-to-Person Transmission of Enterotoxigenic Escherichia Coli Despite Close Contact},
	journal = {American Journal of Epidemiology},
	volume = {111},
	year = {1980},
	pages = {3},
	author = {Levine, M M and Rennels, M B and Cisneros, L and Hughes, T P and Nalin, D R and Young, C R}
}
