@book{6822,
	author = {Lovelock, David, and Rund, Hanno,},
	title = {Tensors, differential forms, and variational principles /},
	publisher = {Wiley,},
	year = {1975.},
	series = {Pure and applied mathematics},
	address = {New York :},
	note = {"A Wiley-Interscience publication."}
}