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@article{JDM_1972__74_146609, author = {H. Rund and D. Lovelock}, title = {Variational {Principles} in the {General} {Theory} of {Relativity.}}, journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung}, pages = {1--65}, publisher = {mathdoc}, volume = {74}, year = {1972}, zbl = {0246.49038}, url = {http://geodesic.mathdoc.fr/item/JDM_1972__74_146609/} }
H. Rund; D. Lovelock. Variational Principles in the General Theory of Relativity.. Jahresbericht der Deutschen Mathematiker-Vereinigung, Tome 74 (1972), pp. 1-65. http://geodesic.mathdoc.fr/item/JDM_1972__74_146609/