Tensors, differential forms, and variational principles / David Lovelock, Hanno Rund. Lovelock, David, 1938- Rund, Hanno, joint author. Calculus of tensors. Differential forms. Calculus of variations. QA433 .L67 515.63 LOT "A Wiley-Interscience publication." Includes index. Bibliography: p. 353-358. New York : Wiley, 1975. 1975. 1975 Text xi, 364 p. ; eng Pure and applied mathematics