@article {Piguet:2000:0264-9381:3799,
	author = "Piguet O.",
	title = "Ghost equations and diffeomorphism-invariant theories",
	journal = "Classical and Quantum Gravity",
	volume = "17",
	year = "2000",
	abstract = "<P>Four-dimensional Einstein gravity in the Palatini first-order formalism is shown to possess a vector supersymmetry of the same type as found in the topological theories for Yang-Mills fields. A peculiar feature of the gravitational theory, characterized by diffeomorphism invariance, is a direct link of vector supersymmetry with the field equation of motion for the Faddeev-Popov ghost of diffeomorphisms.</P>",
	pages = "3799-3806(8)",
	url = "http://www.ingentaconnect.com/content/iop/cqg/2000/00000017/00000018/art00314"
}