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1
by Davis, Julian L.
Published 1990
Springer New York
Table of Contents: “... of Variations, Euler’s Equation -- 4.3. Generalization to Functionals with More Than One Dependent Variable...”
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2
by Davis, Julian L.
Published 1988
Springer New York
Table of Contents: “... Case -- 9.4. Generalization to Functional with More Than One Dependent Variable -- 9.5. Hamilton’s...”