@book{160779,
	author = {Perkins, J.S. and L. Ramberg.},
	title = {Environmental recovery monitoring of tsetse fly spraying impacts in the Okavango delta-2003:},
	publisher = {Harry Opeinheimer Okavango Research Centre, University of Botswana,},
	year = {2004.},
	address = {Maun :}
}