@book{52283,
	author = {Ponsen, M. B.},
	title = {The digestive system of some species of Callaphididae without a filtersystems (Homoptera : aphidoidea)},
	publisher = {Veenman & Zonen,},
	year = {1982},
	series = {Mededelingen Landbouwhogeschool},
	address = {Wageningen :}
}