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- [6] A GENERALIZED EULER-LAGRANGE EQUATION PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY-MATHEMATICAL AND PHYSICAL SCIENCES, 1969, 66 : 399 - &
- [7] EULER-LAGRANGE EQUATION FOR SODIUM ATOM BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1972, 17 (04): : 520 - &
- [10] INVARIANT DERIVATION OF THE EULER-LAGRANGE EQUATION JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1988, 21 (21): : L1013 - L1017