@article {1281,
	title = {The role of natural enemies in the colour polymorphism of Philaenus spumarius (L.)},
	journal = {J. anim. Ecol.},
	volume = {45},
	year = {1976},
	pages = {91-104},
	keywords = {colour polymorphism, natural enemies, parasitoid, Philaenus spumarius, Pipunculidae, Verrallia aucta},
	author = {Harper, G. and Whittaker, J. B.}
}
@article {1742,
	title = {Erratum},
	journal = {J. anim. Ecol.},
	volume = {42},
	year = {1973},
	pages = {829},
	keywords = {Cercopidae, correlation, density dependence, erratum, Philaenus spumarius, Pipunculidae, population},
	author = {Whittaker, J. B.}
}
