Tensors, differential forms, and variational principles /
Lovelock, David,1938-
Rund, Hanno.
New York : Dover,
1989.
Reprint, with rev. appendix. Originally published: New York : Wiley, 1975.
Includes bibliographical references (p. 355-360)
Calculus of tensors.
Differential forms.
Calculus of variations.